Firefox CVE Vulnerabilities

By Mozilla43 known vulnerabilities

Critical
6
High
22
Medium
15
Low
0
None
0

All Firefox CVEs

CVE-2026-7323
7.3 high

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 1

Apr 28, 2026
CVE-2026-6784
7.5 high

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.

Apr 21, 2026
CVE-2026-6783
5.3 medium

Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6782
7.5 high

Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6781
7.5 high

Denial-of-service in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6780
7.5 high

Denial-of-service in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6779
5.3 medium

Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6778
5.3 medium

Invalid pointer in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6777
5.3 medium

Other issue in the Networking: DNS component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6776
7.8 high

Incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6775
5.3 medium

Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6774
5.4 medium

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6773
7.5 high

Denial-of-service due to integer overflow in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6772
7.5 high

Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6771
9.8 critical

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6770
6.5 medium

Other issue in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6769
8.8 high

Privilege escalation in the Debugger component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6768
9.8 critical

Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6767
5.3 medium

Other issue in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6766
7.5 high

Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6765
5.3 medium

Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6764
6.5 medium

Incorrect boundary conditions in the DOM: Device Interfaces component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6763
6.5 medium

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6762
6.3 medium

Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026