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Known vulnerabilities in Mozilla Firefox

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CVE Summary Score Published
CVE-2026-8953 Sandbox escape due to use-after-free in the Disability Access APIs component 9.6 Critical May 19, 2026
CVE-2026-8952 Privilege escalation in the Application Update component 8.8 High May 19, 2026
CVE-2026-8951 Spoofing issue in the Toolbar component in Firefox for Android 6.5 Medium May 19, 2026
CVE-2026-8950 Same-origin policy bypass in the Networking: HTTP component 9.3 Critical May 19, 2026
CVE-2026-8949 Integer overflow in the Widget: Win32 component 7.5 High May 19, 2026
CVE-2026-8948 Same-origin policy bypass in the DOM: Networking component 9.1 Critical May 19, 2026
CVE-2026-8947 Use-after-free in the DOM: Bindings (WebIDL) component 7.3 High May 19, 2026
CVE-2026-8946 Incorrect boundary conditions in the Audio/Video: Web Codecs component 7.5 High May 19, 2026
CVE-2026-8945 Sandbox escape in Firefox and Firefox Focus for Android 7.5 High May 19, 2026
CVE-2026-8401 Sandbox escape in the Profile Backup component 9.8 Critical May 12, 2026
CVE-2026-8391 Other issue in the JavaScript Engine component 5.3 Medium May 12, 2026
CVE-2026-8390 Use-after-free in the JavaScript: WebAssembly component 7.3 High May 12, 2026
CVE-2026-8389 JIT miscompilation in the JavaScript Engine: JIT component 8.8 High May 12, 2026
CVE-2026-8388 Incorrect boundary conditions in the JavaScript Engine: JIT component 6.5 Medium May 12, 2026
CVE-2026-8094 Other issue in the WebRTC component 9.8 Critical May 7, 2026
CVE-2026-8093 Memory safety bugs present in Thunderbird 150.0.1 8.1 High May 7, 2026
CVE-2026-8092 Memory safety bugs present in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1 8.1 High May 7, 2026
CVE-2026-8091 Incorrect boundary conditions in the Audio/Video: Playback component 9.8 Critical May 7, 2026
CVE-2026-8090 Use-after-free in the DOM: Networking component 7.3 High May 7, 2026
CVE-2026-7321 Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component 9.6 Critical Apr 28, 2026
CVE-2026-7324 Memory safety bugs present in Thunderbird 150.0.0 7.3 High Apr 28, 2026
CVE-2026-7323 Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0 7.3 High Apr 28, 2026
CVE-2026-7322 Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0 7.3 High Apr 28, 2026
CVE-2026-7320 Information disclosure due to incorrect boundary conditions in the Audio/Video component 7.5 High Apr 28, 2026
CVE-2026-6786 Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 7.5 High Apr 21, 2026

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