Mozilla vulnerabilities
Published CVEs affecting Mozilla products: 642 record(s), with severity, exploitation and fixes.
Firefox 606Thunderbird 523Firefox Mobile 17Firefox ESR 11Firefox Focus 4Focus 3Thunderbird Esr 2Firefox for Android 2Firefox Os 1Seamonkey 1Thin-vec 10din Scanner 1Rhino 1Klar 1Node-convict 1Network Security Services 1
CVE-2026-74990
Critical · 9.8
CWE-119 Aug 18, 2026
Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154
Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 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.
CVE-2026-74989
Critical · 9.8
CWE-119 Aug 18, 2026
Internally found bugs fixed in Thunderbird 154
Internally found bugs present in Thunderbird 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.
CVE-2026-74988
Critical · 9.8
CWE-119 Aug 18, 2026
Internally found bugs fixed in Thunderbird ESR 153.1 and Thunderbird 154
Internally found bugs present in Thunderbird ESR 153.0 and Thunderbird 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.
CVE-2026-74987
Critical · 9.8
CWE-119 Aug 18, 2026
Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154
Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 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.
CVE-2026-74986
Critical · 9.1
CWE-200 Aug 18, 2026
Site isolation issue in the CSS Parsing and Computation component
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.
CVE-2026-74985
Critical · 9.8
CWE-269 Aug 18, 2026
Privilege escalation in the Enterprise Policies component
Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
CVE-2026-74984
Medium · 6.8
CWE-362 Aug 18, 2026
Race condition in the JavaScript Engine component
Race condition in the JavaScript Engine component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
CVE-2026-74983
High · 8.1
CWE-693 Aug 18, 2026
Mitigation bypass in the Data Loss Prevention component
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.
CVE-2026-74982
High · 7.5
CWE-400 Aug 18, 2026
Denial-of-service in the Widget component
Denial-of-service in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
CVE-2026-74981
High · 8.1
CWE-346 Aug 18, 2026
Site isolation issue in the Audio/Video: Web Codecs component
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.
CVE-2026-74980
Medium · 6.5
CWE-1021 Aug 18, 2026
Clickjacking issue in the Downloads component in Firefox for Android
Clickjacking issue in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 154.
CVE-2026-74979
Critical · 9.8
CWE-284 Aug 18, 2026
Mitigation bypass in the Add-ons Manager component
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.
CVE-2026-74978
High · 8.1
CWE-1021 Aug 18, 2026
Clickjacking issue in the Widget component
Clickjacking issue in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
CVE-2026-74977
High · 7.5
CWE-190 Aug 18, 2026
Integer overflow in the Graphics component
Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
CVE-2026-74976
Medium · 6.5
CWE-843 Aug 18, 2026
JIT miscompilation in the JavaScript Engine: JIT component
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.
CVE-2026-74975
Medium · 5.4
CWE-451 Aug 18, 2026
Spoofing issue in the Downloads component in Firefox for Android
Spoofing issue in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 154.
CVE-2026-74974
Medium · 5.4
CWE-346 Aug 18, 2026
Same-origin policy bypass in the Graphics: ImageLib component
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.
CVE-2026-74973
Medium · 4.2
CWE-362 Aug 18, 2026
Race condition, use-after-free in the Graphics component
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.
CVE-2026-74972
Medium · 4.3
CWE-200 Aug 18, 2026
Information disclosure in the DOM: Push Subscriptions component
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.
CVE-2026-74971
Medium · 4.3
CWE-200 Aug 18, 2026
Information disclosure in the DOM: UI Events & Focus Handling component
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.
CVE-2026-74970
Medium · 5.4
CWE-346 Aug 18, 2026
Site isolation issue in the Graphics component
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
CVE-2026-74969
High · 8.8
CWE-416 Aug 18, 2026
Use-after-free in the Layout: Text and Fonts component
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.
CVE-2026-74968
Medium · 5.4
CWE-346 Aug 18, 2026
Site isolation issue in the Graphics: WebRender component
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.
CVE-2026-74967
Medium · 5.4
CWE-346 Aug 18, 2026
Same-origin policy bypass in the Audio/Video: Playback component
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.
CVE-2026-74966
High · 7.5
CWE-359 Aug 18, 2026
Information disclosure in the Form Autofill component
Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.