Updated 26 min ago

Vulnerability database

Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.

1,764exploited flaws on CISA’s list

36added in the last 30 days

479new WordPress flaws this week

390,525entries in the database

4,194 results · page 7 of 84

Sep 29, 2026Race condition, use-after-free in the Audio/Video component.CVE-2026-100805 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Race condition, use-after-free in the Audio/Video component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape due to use-after-free in the Preferences: Backend component.CVE-2026-100804 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Same-origin policy bypass in the WebExtensions component.CVE-2026-100803 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Same-origin policy bypass in the WebExtensions component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Uninitialized memory in the Graphics: WebGPU component.CVE-2026-100802 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Privilege escalation in the DLL Services component.CVE-2026-100801 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation in the DLL Services component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 159, Firefox ESR 153.6, Thunderbird 159, Thunderbird 153.6, Firefox 157, and Firefox ESR 140.17.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape due to use-after-free in the Disability Access APIs component.CVE-2026-100800 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Uninitialized memory in the Graphics: WebGPU component.CVE-2026-100799 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Cryptography misuse in Storage: Quota Manager component.CVE-2026-100798 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Cryptography misuse in Storage: Quota Manager component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Privilege escalation due to use-after-free in the Graphics: WebRender component.CVE-2026-100797 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the JavaScript: WebAssembly component.CVE-2026-100796 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Denial-of-service in the Networking component.CVE-2026-100795 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Denial-of-service in the Networking component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape due to incorrect boundary conditions in the Internationalization component.CVE-2026-100794 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026JIT miscompilation in the JavaScript Engine component.CVE-2026-100793 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026JIT miscompilation in the JavaScript: WebAssembly component.CVE-2026-100792 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.1
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the DOM: Core & HTML component.CVE-2026-100791 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the XSLT component.CVE-2026-100790 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the XSLT component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the Graphics: Canvas2D component.CVE-2026-100789 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Invalid pointer in the JavaScript: WebAssembly component.CVE-2026-100788 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape in the XUL component.CVE-2026-100787 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape in the XUL component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape due to use-after-free in the Graphics component.CVE-2026-100786 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to use-after-free in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the DOM: Core & HTML component.CVE-2026-100785 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the Layout: Text and Fonts component.CVE-2026-100784 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Uninitialized memory in the Audio/Video component.CVE-2026-100783 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Uninitialized memory in the Audio/Video component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Privilege escalation due to incorrect boundary conditions in the Graphics component.CVE-2026-100782 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component.CVE-2026-100781 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the DOM: Core & HTML component.CVE-2026-100780 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the XSLT component.CVE-2026-100779 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the XSLT component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape due to use-after-free in the DOM: Core & HTML component.CVE-2026-100778 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the Graphics: Canvas2D component.CVE-2026-100777 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the JavaScript: WebAssembly component.CVE-2026-100776 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape in the Graphics component.CVE-2026-100775 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the DOM: Core & HTML component.CVE-2026-100774 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the Storage: IndexedDB component.CVE-2026-100773 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the DOM: Core & HTML component.CVE-2026-100772 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Undefined behavior in the DOM: Streams component.CVE-2026-100771 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Undefined behavior in the DOM: Streams component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape due to use-after-free in the DOM: Content Processes component.CVE-2026-100770 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to use-after-free in the DOM: Content Processes component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the JavaScript: WebAssembly component.CVE-2026-100769 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the Graphics: WebGPU component.CVE-2026-100768 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the Networking: Cache component.CVE-2026-100767 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the Networking: Cache component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Information disclosure in the Networking: JAR component.CVE-2026-100766 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the JavaScript: WebAssembly component.CVE-2026-100765 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Privilege escalation due to incorrect boundary conditions in the Graphics: WebGPU component.CVE-2026-100764 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Incorrect boundary conditions in the Graphics: WebGPU component.CVE-2026-100763 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.1
Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape due to use-after-free in the DOM: Content Processes component.CVE-2026-100762 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to use-after-free in the DOM: Content Processes component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Privilege escalation due to use-after-free in the Graphics: WebGPU component.CVE-2026-100761 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape in the Security: Process Sandboxing component.CVE-2026-100760 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Uninitialized memory in the Storage: Quota Manager component.CVE-2026-100759 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Uninitialized memory in the Storage: Quota Manager component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Sandbox escape in the DOM: Navigation component.CVE-2026-100758 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Use-after-free in the Widget component.CVE-2026-100757 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free in the Widget component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Sep 29, 2026Incorrect boundary conditions in the Audio/Video: Playback component.CVE-2026-100756 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org

Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.

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