Mozilla Firefox vulnerabilities
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Published CVEs affecting Mozilla Firefox: 606 record(s), with affected versions and fixes.cpe:2.3:a:mozilla:firefox
CVE-2026-8706
Medium · 6.5
CWE-200 May 19, 2026
Sensitive user data could be leaked to other applications through Reader mode
Firefox for iOS hosted Reader mode on an unauthenticated local web server, allowing another application on the same device to request arbitrary URLs and receive the response rendered with the signed-in user's cookies. This vulnerability was fixed in Firefox for iOS 151.0.
CVE-2026-8975
High · 8.8
CWE-119 May 19, 2026
Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151
Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVE-2026-8974
High · 8.8
CWE-119 May 19, 2026
Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151
Memory safety bugs present in Firefox ESR 140.10 and Firefox 150. 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 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVE-2026-8973
High · 8.8
CWE-119 May 19, 2026
Memory safety bugs fixed in Firefox 151
Memory safety bugs present in Firefox 150. 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 151 and Thunderbird 151.
CVE-2026-8972
High · 8.8
CWE-269 May 19, 2026
Privilege escalation in the WebRTC: Audio/Video component
Privilege escalation in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
CVE-2026-8971
Medium · 6.5
CWE-346 May 19, 2026
Same-origin policy bypass in the Networking: JAR component
Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
CVE-2026-8970
High · 8.8
CWE-269 May 19, 2026
Privilege escalation in the Security component
Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVE-2026-8969
High · 8.1
CWE-693 May 19, 2026
Mitigation bypass in the DOM: Security component
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
CVE-2026-8968
High · 7.5
CWE-400 May 19, 2026
Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component
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.
CVE-2026-8967
High · 7.5
CWE-200 May 19, 2026
Information disclosure in the Graphics: WebGPU component
Information disclosure in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
CVE-2026-8966
High · 7.5
CWE-200 May 19, 2026
Information disclosure in the IP Protection component
Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
CVE-2026-8965
High · 7.5
CWE-200 May 19, 2026
Information disclosure in the DOM: Security component
Information disclosure in the DOM: Security component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
CVE-2026-8964
High · 7.5
CWE-451 May 19, 2026
Spoofing issue in the Popup Blocker component
Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
CVE-2026-8963
High · 7.5
CWE-290 May 19, 2026
Spoofing issue in the Web Speech component
Spoofing issue in the Web Speech component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
CVE-2026-8962
High · 8.1
CWE-693 May 19, 2026
Mitigation bypass in the DOM: Security component
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVE-2026-8961
Medium · 6.5
CWE-290 May 19, 2026
Spoofing issue in the Form Autofill component
Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVE-2026-8960
High · 7.5
CWE-290 May 19, 2026
Spoofing issue in WebExtensions
Spoofing issue in WebExtensions. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
CVE-2026-8959
Critical · 9.6
CWE-20 May 19, 2026
Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component
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.
CVE-2026-8958
High · 8.6
CWE-668 May 19, 2026
Information disclosure, sandbox escape in the Security: Process Sandboxing component
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.
CVE-2026-8957
High · 8.8
CWE-269 May 19, 2026
Privilege escalation in the Enterprise Policies component
Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVE-2026-8956
Critical · 9.8
CWE-190 May 19, 2026
Integer overflow in the Networking: JAR component
Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVE-2026-8955
High · 8.8
CWE-269 May 19, 2026
Privilege escalation in the DOM: Workers component
Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVE-2026-8954
High · 7.5
CWE-119 May 19, 2026
Incorrect boundary conditions, integer overflow in the Audio/Video component
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.
CVE-2026-8953
Critical · 9.6
CWE-416 May 19, 2026
Sandbox escape due to use-after-free in the Disability Access APIs component
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.
CVE-2026-8952
High · 8.8
CWE-269 May 19, 2026
Privilege escalation in the Application Update component
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.