MGASA-2026-0346

Site isolation issue in the Graphics: CanvasWebGL component. (CVE-2026-74934) Privilege escalation in the DOM: Networking component. (CVE-2026-74935) Use-after-free in the JavaScript: WebAssembly component. (CVE-2026-74936) Use-after-free in the JavaScript: GC component. (CVE-2026-74937) Mitigation bypass in the JavaScript: GC component. (CVE-2026-74938) Privilege escalation in the DOM: Navigation component. (CVE-2026-74939) Use-after-free in the Graphics: Text component. (CVE-2026-74940) Privilege escalation in the Graphics: CanvasWebGL component. (CVE-2026-74941) Privilege escalation in the Remote Settings Client component. (CVE-2026-74942) Use-after-free in the Graphics: ImageLib component. (CVE-2026-74943) Use-after-free in the DOM: Core & HTML component. (CVE-2026-74944) Information disclosure in the Graphics: Text component. (CVE-2026-74945) Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. (CVE-2026-74946) Privilege escalation due to invalid pointer in the Graphics component. (CVE-2026-74947) Information disclosure in the Graphics component. (CVE-2026-74948) Privilege escalation in the Downloads API component. (CVE-2026-74950) Privilege escalation in the Networking: Cookies component. (CVE-2026-74953) Information disclosure due to side-channel in the Storage: Cache API component. (CVE-2026-74954) Privilege escalation in the Request Handling component. (CVE-2026-74955) Same-origin policy bypass in the DOM: Service Workers component. (CVE-2026-74956) Mitigation bypass in the Safe Browsing component. (CVE-2026-74957) Information disclosure in the WebRTC component. (CVE-2026-74958) Mitigation bypass in the Storage: Cache API component. (CVE-2026-74959) Site isolation issue in the WebExtensions component. (CVE-2026-74960) Side-channel in the Web Audio component. (CVE-2026-74961) Site isolation issue in the Networking: Cookies component. (CVE-2026-74962) Same-origin policy bypass in the Networking: Cookies component. (CVE-2026-74963) Integer overflow in the Graphics component. (CVE-2026-74964) Privilege escalation in the Shell Integration component. (CVE-2026-74965) Information disclosure in the Form Autofill component. (CVE-2026-74966) Same-origin policy bypass in the Audio/Video: Playback component. (CVE-2026-74967) Site isolation issue in the Graphics: WebRender component. (CVE-2026-74968) Use-after-free in the Layout: Text and Fonts component. (CVE-2026-74969) Site isolation issue in the Graphics component. (CVE-2026-74970) Information disclosure in the DOM: UI Events & Focus Handling component. (CVE-2026-74971) Information disclosure in the DOM: Push Subscriptions component. (CVE-2026-74972) Use-after-free in the Graphics: Canvas2D component. (CVE-2026-74949) Race condition, use-after-free in the Graphics component. (CVE-2026-74973) Same-origin policy bypass in the Graphics: ImageLib component. (CVE-2026-74974) JIT miscompilation in the JavaScript Engine: JIT component. (CVE-2026-74976) Integer overflow in the Graphics component. (CVE-2026-74977) Clickjacking issue in the Widget component. (CVE-2026-74978) Mitigation bypass in the Add-ons Manager component. (CVE-2026-74979) Site isolation issue in the Audio/Video: Web Codecs component. (CVE-2026-74981) Denial-of-service in the Widget component. (CVE-2026-74982) Mitigation bypass in the Data Loss Prevention component. (CVE-2026-74983) Race condition in the JavaScript Engine component. (CVE-2026-74984) Privilege escalation in the Enterprise Policies component. (CVE-2026-74985) Site isolation issue in the CSS Parsing and Computation component. (CVE-2026-74986) Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154. (CVE-2026-74987) Internally found bugs fixed in Thunderbird ESR 153.1 and Thunderbird 154 (CVE-2026-74988) Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154. (CVE-2026-74990)