Updated 7 h 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

477new WordPress flaws this week

390,525entries in the database

4,194 results · page 10 of 84

Sep 1, 2026Site isolation issue in the DOM: Navigation component.CVE-2026-84129 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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
Sep 1, 2026Privilege escalation in the WebDriver BiDi component.CVE-2026-84128 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation in the WebDriver BiDi component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
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 1, 2026Information disclosure in the WebExtensions component in Firefox for Android.CVE-2026-84127 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Information disclosure in the WebExtensions component in Firefox for Android. This vulnerability was fixed in Firefox 155.
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 1, 2026Incorrect boundary conditions in the Layout: Grid component.CVE-2026-84126 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Incorrect boundary conditions in the Layout: Grid component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
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 1, 2026Use-after-free in the DOM: Core & HTML component.CVE-2026-84125 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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
Sep 1, 2026Use-after-free in the DOM: Core & HTML component.CVE-2026-84124 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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
Sep 1, 2026Privilege escalation due to use-after-free in the Graphics: WebGPU component.CVE-2026-84123 · 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 Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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
Sep 1, 2026Use-after-free in the Audio/Video component.CVE-2026-84122 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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
Sep 1, 2026Sandbox escape due to use-after-free in the DOM: Security component.CVE-2026-84121 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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
Sep 1, 2026Use-after-free in the Audio/Video component.CVE-2026-84120 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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
Sep 1, 2026Sandbox escape due to use-after-free in the DOM: Navigation component.CVE-2026-84119 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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
Sep 1, 2026Use-after-free in the JavaScript: GC component.CVE-2026-84118 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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
Sep 1, 2026Privilege escalation in Firefox for Android.CVE-2026-84117 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation in Firefox for Android. This vulnerability was fixed in Firefox 155.
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
Aug 31, 2026A malicious webpage could stall a popup's cross-origin navigation after commit, causing the address bar to display the destination origin while continuing to reCVE-2026-81267 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
A malicious webpage could stall a popup's cross-origin navigation after commit, causing the address bar to display the destination origin while continuing to render attacker-controlled content. This vulnerability was fixed in Firefox for iOS 155.0.
Product
Firefox for iOS
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
Aug 18, 2026Sandbox escape in the Remote Settings Client component.CVE-2026-75874 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 10
Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and Thunderbird 153.2.
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
Aug 18, 2026Internally found bugs present in Firefox ESR 115.38, Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153.CVE-2026-74990 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Internally found bugs present in Firefox ESR 115.38, Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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 bugzilla.mozilla.org
Aug 18, 2026Internally found bugs present in Firefox 153.CVE-2026-74989 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Internally found bugs present in Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154 and Thunderbird 154.
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 bugzilla.mozilla.org
Aug 18, 2026Internally found bugs present in Firefox ESR 153.0 and Firefox 153.CVE-2026-74988 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Internally found bugs present in Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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 bugzilla.mozilla.org
Aug 18, 2026Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153.CVE-2026-74987 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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 bugzilla.mozilla.org
Aug 18, 2026Site isolation issue in the CSS Parsing and Computation component.CVE-2026-74986 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.1
Site isolation issue in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Privilege escalation in the Enterprise Policies component.CVE-2026-74985 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Race condition in the JavaScript Engine component.CVE-2026-74984 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.8
Race condition in the JavaScript Engine component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Mitigation bypass in the Data Loss Prevention component.CVE-2026-74983 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Denial-of-service in the Widget component.CVE-2026-74982 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Denial-of-service in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Site isolation issue in the Audio/Video: Web Codecs component.CVE-2026-74981 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Site isolation issue in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Clickjacking issue in the Downloads component in Firefox for Android.CVE-2026-74980 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Clickjacking issue in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 154.
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
Aug 18, 2026Mitigation bypass in the Add-ons Manager component.CVE-2026-74979 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Mitigation bypass in the Add-ons Manager component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Clickjacking issue in the Widget component.CVE-2026-74978 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Clickjacking issue in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Integer overflow in the Graphics component.CVE-2026-74977 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026JIT miscompilation in the JavaScript Engine: JIT component.CVE-2026-74976 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Spoofing issue in the Downloads component in Firefox for Android.CVE-2026-74975 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Spoofing issue in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 154.
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
Aug 18, 2026Same-origin policy bypass in the Graphics: ImageLib component.CVE-2026-74974 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Race condition, use-after-free in the Graphics component.CVE-2026-74973 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.2
Race condition, use-after-free in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Information disclosure in the DOM: Push Subscriptions component.CVE-2026-74972 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Information disclosure in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Information disclosure in the DOM: UI Events & Focus Handling component.CVE-2026-74971 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Information disclosure in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Site isolation issue in the Graphics component.CVE-2026-74970 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Race condition, use-after-free in the Layout: Text and Fonts component.CVE-2026-74969 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Race condition, use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Site isolation issue in the Graphics: WebRender component.CVE-2026-74968 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Same-origin policy bypass in the Audio/Video: Playback component.CVE-2026-74967 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Same-origin policy bypass in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Information disclosure in the Form Autofill component.CVE-2026-74966 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Privilege escalation in the Shell Integration component.CVE-2026-74965 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation in the Shell Integration component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Integer overflow in the Graphics component.CVE-2026-74964 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Same-origin policy bypass in the Networking: Cookies component.CVE-2026-74963 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Site isolation issue in the Networking: Cookies component.CVE-2026-74962 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Site isolation issue in the Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Side-channel in the Web Audio component.CVE-2026-74961 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.1
Side-channel in the Web Audio component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Site isolation issue in the WebExtensions component.CVE-2026-74960 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Site isolation issue in the WebExtensions component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Mitigation bypass in the Storage: Cache API component.CVE-2026-74959 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.1
Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Information disclosure in the WebRTC component.CVE-2026-74958 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Information disclosure in the WebRTC component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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
Aug 18, 2026Mitigation bypass in the Safe Browsing component.CVE-2026-74957 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Mitigation bypass in the Safe Browsing component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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
Aug 18, 2026Same-origin policy bypass in the DOM: Service Workers component.CVE-2026-74956 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.1
Same-origin policy bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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

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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