Skip to content

Known vulnerabilities in Mozilla Firefox

Is your version affected?

CVE Summary Score Published
CVE-2026-74960 Site isolation issue in the WebExtensions component 8.1 High Aug 18, 2026
CVE-2026-74962 Site isolation issue in the Networking: Cookies component 8.1 High Aug 18, 2026
CVE-2026-74946 Information disclosure due to incorrect boundary conditions in the Graphics: CanvasWebGL component 8.8 High Aug 18, 2026
CVE-2026-74948 Information disclosure in the Graphics component 6.5 Medium Aug 18, 2026
CVE-2026-74949 Use-after-free in the Graphics: Canvas2D component 8.8 High Aug 18, 2026
CVE-2026-74953 Privilege escalation in the Networking: Cookies component 8.8 High Aug 18, 2026
CVE-2026-74944 Use-after-free in the DOM: Core & HTML component 9.8 Critical Aug 18, 2026
CVE-2026-74945 Information disclosure in the Graphics: Text component 6.5 Medium Aug 18, 2026
CVE-2026-74942 Privilege escalation in the Remote Settings Client component 8.8 High Aug 18, 2026
CVE-2026-74943 Use-after-free in the Graphics: ImageLib component 9.8 Critical Aug 18, 2026
CVE-2026-74939 Privilege escalation in the DOM: Navigation component 8.8 High Aug 18, 2026
CVE-2026-74940 Use-after-free in the Graphics: Text component 9.8 Critical Aug 18, 2026
CVE-2026-74941 Privilege escalation in the Graphics: CanvasWebGL component 8.8 High Aug 18, 2026
CVE-2026-74934 Site isolation issue in the Graphics: CanvasWebGL component 7.5 High Aug 18, 2026
CVE-2026-74935 Privilege escalation in the DOM: Networking component 8.8 High Aug 18, 2026
CVE-2026-74936 Use-after-free in the JavaScript: WebAssembly component 9.8 Critical Aug 18, 2026
CVE-2026-18809 Information disclosure in Firefox for Android and Firefox Focus for Android 6.5 Medium Aug 4, 2026
CVE-2026-16361 Memory safety bugs present in Thunderbird ESR 140.12 9.8 Critical Jul 21, 2026
CVE-2026-16360 Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152 9.8 Critical Jul 21, 2026
CVE-2026-16412 Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152 9.8 Critical Jul 21, 2026
CVE-2026-16411 Memory safety bugs present in Thunderbird 152 9.8 Critical Jul 21, 2026
CVE-2026-16410 JIT miscompilation in the JavaScript Engine: JIT component 9.8 Critical Jul 21, 2026
CVE-2026-16409 Invalid pointer in the Security: PSM component 7.5 High Jul 21, 2026
CVE-2026-16407 Mitigation bypass in the DOM: Service Workers component 9.8 Critical Jul 21, 2026
CVE-2026-16408 Integer overflow in the Audio/Video: Playback component 9.8 Critical Jul 21, 2026

Other Mozilla products