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Known vulnerabilities in Mozilla Thunderbird

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CVE Summary Score Published
CVE-2026-74989 Internally found bugs present in Firefox 153 9.8 Critical Aug 18, 2026
CVE-2026-74984 Race condition in the JavaScript Engine component 6.8 Medium Aug 18, 2026
CVE-2026-74981 Site isolation issue in the Audio/Video: Web Codecs component 8.1 High Aug 18, 2026
CVE-2026-74982 Denial-of-service in the Widget component 7.5 High Aug 18, 2026
CVE-2026-74977 Integer overflow in the Graphics component 7.5 High Aug 18, 2026
CVE-2026-74978 Clickjacking issue in the Widget component 8.1 High Aug 18, 2026
CVE-2026-74979 Mitigation bypass in the Add-ons Manager component 9.8 Critical Aug 18, 2026
CVE-2026-74966 Information disclosure in the Form Autofill component 7.5 High Aug 18, 2026
CVE-2026-74968 Site isolation issue in the Graphics: WebRender component 5.4 Medium Aug 18, 2026
CVE-2026-74970 Site isolation issue in the Graphics component 5.4 Medium Aug 18, 2026
CVE-2026-74961 Side-channel in the Web Audio component 9.1 Critical Aug 18, 2026
CVE-2026-74954 Information disclosure due to side-channel in the Storage: Cache API component 7.5 High Aug 18, 2026
CVE-2026-74955 Privilege escalation in the Request Handling component 8.8 High Aug 18, 2026
CVE-2026-74956 Same-origin policy bypass in the DOM: Service Workers component 9.1 Critical Aug 18, 2026
CVE-2026-74958 Information disclosure in the WebRTC component 7.5 High Aug 18, 2026
CVE-2026-74947 Privilege escalation due to invalid pointer in the Graphics component 8.8 High Aug 18, 2026
CVE-2026-74950 Privilege escalation in the Downloads API component 8.8 High Aug 18, 2026
CVE-2026-74952 Privilege escalation in the Application Update component 8.8 High Aug 18, 2026
CVE-2026-74937 Use-after-free in the JavaScript: GC component 8.8 High Aug 18, 2026
CVE-2026-74938 Mitigation bypass in the JavaScript: GC component 9.1 Critical Aug 18, 2026
CVE-2026-74990 Internally found bugs present in Firefox ESR 115.38, Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153 9.8 Critical Aug 18, 2026
CVE-2026-75874 Sandbox escape in the Remote Settings Client component 10.0 Critical Aug 18, 2026
CVE-2026-74974 Same-origin policy bypass in the Graphics: ImageLib component 5.4 Medium Aug 18, 2026
CVE-2026-74976 JIT miscompilation in the JavaScript Engine: JIT component 6.5 Medium Aug 18, 2026
CVE-2026-74987 Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153 9.8 Critical Aug 18, 2026

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