Updated 4 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

35added in the last 30 days

474new WordPress flaws this week

390,714entries in the database

4,194 results · page 14 of 84

May 19, 2026Privilege escalation in the WebRTC: Audio/Video component.CVE-2026-8972 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Same-origin policy bypass in the Networking: JAR component.CVE-2026-8971 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Privilege escalation in the Security component.CVE-2026-8970 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Mitigation bypass in the DOM: Security component.CVE-2026-8969 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component.CVE-2026-8968 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Information disclosure in the Graphics: WebGPU component.CVE-2026-8967 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Information disclosure in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Information disclosure in the IP Protection component.CVE-2026-8966 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Information disclosure in the DOM: Security component.CVE-2026-8965 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Information disclosure in the DOM: Security component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Spoofing issue in the Popup Blocker component.CVE-2026-8964 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Spoofing issue in the Web Speech component.CVE-2026-8963 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Spoofing issue in the Web Speech component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Mitigation bypass in the DOM: Security component.CVE-2026-8962 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Spoofing issue in the Form Autofill component.CVE-2026-8961 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Spoofing issue in WebExtensions.CVE-2026-8960 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Spoofing issue in WebExtensions. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.CVE-2026-8959 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Information disclosure, sandbox escape in the Security: Process Sandboxing component.CVE-2026-8958 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.6
Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Privilege escalation in the Enterprise Policies component.CVE-2026-8957 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Integer overflow in the Networking: JAR component.CVE-2026-8956 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Privilege escalation in the DOM: Workers component.CVE-2026-8955 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Incorrect boundary conditions, integer overflow in the Audio/Video component.CVE-2026-8954 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Sandbox escape due to use-after-free in the Disability Access APIs component.CVE-2026-8953 · 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Privilege escalation in the Application Update component.CVE-2026-8952 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Spoofing issue in the Toolbar component in Firefox for Android.CVE-2026-8951 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Spoofing issue in the Toolbar component in Firefox for Android. This vulnerability was fixed in Firefox 151.
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
May 19, 2026Same-origin policy bypass in the Networking: HTTP component.CVE-2026-8950 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.3
Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Integer overflow in the Widget: Win32 component.CVE-2026-8949 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Same-origin policy bypass in the DOM: Networking component.CVE-2026-8948 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.1
Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
May 19, 2026Use-after-free in the DOM: Bindings (WebIDL) component.CVE-2026-8947 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.3
Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Incorrect boundary conditions in the Audio/Video: Web Codecs component.CVE-2026-8946 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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
May 19, 2026Sandbox escape in Firefox and Firefox Focus for Android.CVE-2026-8945 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.
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
May 12, 2026Sandbox escape in the Profile Backup component.CVE-2026-8401 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
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
May 12, 2026Other issue in the JavaScript Engine component.CVE-2026-8391 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.3
Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
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
May 12, 2026Use-after-free in the JavaScript: WebAssembly component.CVE-2026-8390 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.3
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.
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
May 12, 2026JIT miscompilation in the JavaScript Engine: JIT component.CVE-2026-8389 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.
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
May 12, 2026Incorrect boundary conditions in the JavaScript Engine: JIT component.CVE-2026-8388 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
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
May 7, 2026Other issue in the WebRTC component.CVE-2026-8094 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2 and Thunderbird 140.10.2.
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
May 7, 2026Memory safety bugs present in Thunderbird 150.0.1.CVE-2026-8093 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Memory safety bugs present in Thunderbird 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.2 and Thunderbird 150.0.2.
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
May 7, 2026Memory safety bugs present in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1.CVE-2026-8092 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Memory safety bugs present in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.
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
May 7, 2026Incorrect boundary conditions in the Audio/Video: Playback component.CVE-2026-8091 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
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
May 7, 2026Use-after-free in the DOM: Networking component.CVE-2026-8090 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.3
Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.
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
Apr 28, 2026Memory safety bugs present in Thunderbird 150.0.0.CVE-2026-7324 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.3
Memory safety bugs present in Thunderbird 150.0.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.1 and Thunderbird 150.0.1.
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
Apr 28, 2026Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0.CVE-2026-7323 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.3
Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.
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
Apr 28, 2026Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0.CVE-2026-7322 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.3
Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.
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
Apr 28, 2026Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component.CVE-2026-7321 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.
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
Apr 28, 2026Information disclosure due to incorrect boundary conditions in the Audio/Video component.CVE-2026-7320 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Information disclosure due to incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.
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
Apr 26, 2026Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149.CVE-2026-6786 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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
Apr 26, 2026Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149.CVE-2026-6785 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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
Apr 21, 2026Memory safety bugs present in Firefox 149 and Thunderbird 149.CVE-2026-6784 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Memory safety bugs present in Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
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
Apr 21, 2026Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component.CVE-2026-6783 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.3
Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
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
Apr 21, 2026Information disclosure in the IP Protection component.CVE-2026-6782 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
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
Apr 21, 2026Denial-of-service in the Audio/Video: Playback component.CVE-2026-6781 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Denial-of-service in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
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
Apr 21, 2026Denial-of-service in the Audio/Video: Playback component.CVE-2026-6780 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Denial-of-service in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
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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