Firefox CVE Vulnerabilities

By Mozilla81 known vulnerabilities

Critical
11
High
48
Medium
22
Low
0
None
0

All Firefox CVEs

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
CVE-2026-6761
8.8 high

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

Apr 21, 2026
CVE-2026-6760
9.8 critical

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

Apr 21, 2026
CVE-2026-6759
7.5 high

Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6758
7.5 high

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Apr 21, 2026
CVE-2026-6757
6.3 medium

Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6756
7.5 high

Mitigation bypass in Firefox for Android. This vulnerability was fixed in Firefox 150.

Apr 21, 2026
CVE-2026-6755
6.5 medium

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

Apr 21, 2026
CVE-2026-6754
7.5 high

Use-after-free in the JavaScript Engine 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
CVE-2026-6753
7.3 high

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

Apr 21, 2026
CVE-2026-6752
7.3 high

Incorrect boundary conditions in the WebRTC 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