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Known vulnerabilities in Mozilla Thunderbird

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CVE Summary Score Published
CVE-2026-74983 Mitigation bypass in the Data Loss Prevention component 8.1 High Aug 18, 2026
CVE-2026-74969 Race condition, use-after-free in the Layout: Text and Fonts component 8.8 High Aug 18, 2026
CVE-2026-74971 Information disclosure in the DOM: UI Events & Focus Handling component 4.3 Medium Aug 18, 2026
CVE-2026-74972 Information disclosure in the DOM: Push Subscriptions component 4.3 Medium Aug 18, 2026
CVE-2026-74973 Race condition, use-after-free in the Graphics component 4.2 Medium Aug 18, 2026
CVE-2026-74964 Integer overflow in the Graphics component 9.8 Critical Aug 18, 2026
CVE-2026-74965 Privilege escalation in the Shell Integration component 8.8 High Aug 18, 2026
CVE-2026-74967 Same-origin policy bypass in the Audio/Video: Playback component 5.4 Medium Aug 18, 2026
CVE-2026-74963 Same-origin policy bypass in the Networking: Cookies component 5.4 Medium Aug 18, 2026
CVE-2026-74957 Mitigation bypass in the Safe Browsing component 8.1 High Aug 18, 2026
CVE-2026-74959 Mitigation bypass in the Storage: Cache API component 9.1 Critical Aug 18, 2026
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

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