# Mozilla Firefox (en-US) 151.0 Mozilla Firefox (en-US) 151.0, released May 19, 2026, fixes 31 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs. - Web page: https://patchblox.com/security/fix/windows-app/mozilla.firefox-151.0 - Platform: Windows apps - Released: May 19, 2026 - Priority: Urgent (Closes CVE-2026-8948, rated Critical) - CVEs: 31, exploited: 0, on CISA KEV: 0 - Superseded by: [Mozilla Firefox (en-US) 159.0](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-en-us.md), the latest version, which also fixes every CVE listed here ## Applies to | Product | Release | Fixed in | |---|---|---| | [Mozilla Firefox (en-US)](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-en-us.md) | | 151.0 | ## CVEs this fix closes | CVE | Priority | Title | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2026-8948](https://patchblox.com/security/data/cve/CVE-2026-8948.md) | Urgent | Same-origin policy bypass in the DOM: Networking component | 9.1 | 0.0042 | | | [CVE-2026-8956](https://patchblox.com/security/data/cve/CVE-2026-8956.md) | High | Integer overflow in the Networking: JAR component | 9.8 | 0.0061 | | | [CVE-2026-8949](https://patchblox.com/security/data/cve/CVE-2026-8949.md) | High | Integer overflow in the Widget: Win32 component | 7.5 | 0.0058 | | | [CVE-2026-8946](https://patchblox.com/security/data/cve/CVE-2026-8946.md) | High | Incorrect boundary conditions in the Audio/Video: Web Codecs component | 7.5 | 0.0056 | | | [CVE-2026-8953](https://patchblox.com/security/data/cve/CVE-2026-8953.md) | High | Sandbox escape due to use-after-free in the Disability Access APIs component | 9.6 | 0.0053 | | | [CVE-2026-8975](https://patchblox.com/security/data/cve/CVE-2026-8975.md) | High | Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151 | 8.8 | 0.0047 | | | [CVE-2026-8954](https://patchblox.com/security/data/cve/CVE-2026-8954.md) | High | Incorrect boundary conditions, integer overflow in the Audio/Video component | 7.5 | 0.0043 | | | [CVE-2026-8959](https://patchblox.com/security/data/cve/CVE-2026-8959.md) | High | Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component | 9.6 | 0.0042 | | | [CVE-2026-8947](https://patchblox.com/security/data/cve/CVE-2026-8947.md) | High | Use-after-free in the DOM: Bindings (WebIDL) component | 7.5 | 0.0041 | | | [CVE-2026-8968](https://patchblox.com/security/data/cve/CVE-2026-8968.md) | High | Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component | 7.5 | 0.0041 | | | [CVE-2026-8955](https://patchblox.com/security/data/cve/CVE-2026-8955.md) | High | Privilege escalation in the DOM: Workers component | 8.8 | 0.0039 | | | [CVE-2026-8957](https://patchblox.com/security/data/cve/CVE-2026-8957.md) | High | Privilege escalation in the Enterprise Policies component | 8.8 | 0.0039 | | | [CVE-2026-8960](https://patchblox.com/security/data/cve/CVE-2026-8960.md) | High | Spoofing issue in WebExtensions | 7.5 | 0.0038 | | | [CVE-2026-8952](https://patchblox.com/security/data/cve/CVE-2026-8952.md) | High | Privilege escalation in the Application Update component | 8.8 | 0.0037 | | | [CVE-2026-8962](https://patchblox.com/security/data/cve/CVE-2026-8962.md) | High | Mitigation bypass in the DOM: Security component | 8.1 | 0.0037 | | | [CVE-2026-8945](https://patchblox.com/security/data/cve/CVE-2026-8945.md) | High | Sandbox escape in Firefox and Firefox Focus for Android | 7.5 | 0.0037 | | | [CVE-2026-8973](https://patchblox.com/security/data/cve/CVE-2026-8973.md) | High | Memory safety bugs fixed in Thunderbird 151 | 8.8 | 0.0037 | | | [CVE-2026-8974](https://patchblox.com/security/data/cve/CVE-2026-8974.md) | High | Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151 | 8.8 | 0.0037 | | | [CVE-2026-8958](https://patchblox.com/security/data/cve/CVE-2026-8958.md) | High | Information disclosure, sandbox escape in the Security: Process Sandboxing component | 8.6 | 0.0034 | | | [CVE-2026-8966](https://patchblox.com/security/data/cve/CVE-2026-8966.md) | High | Information disclosure in the IP Protection component | 7.5 | 0.0033 | | | [CVE-2026-8967](https://patchblox.com/security/data/cve/CVE-2026-8967.md) | High | Information disclosure in the Graphics: WebGPU component | 7.5 | 0.0033 | | | [CVE-2026-8972](https://patchblox.com/security/data/cve/CVE-2026-8972.md) | High | Privilege escalation in the WebRTC: Audio/Video component | 8.8 | 0.0033 | | | [CVE-2026-8965](https://patchblox.com/security/data/cve/CVE-2026-8965.md) | High | Information disclosure in the DOM: Security component | 7.5 | 0.0032 | | | [CVE-2026-8961](https://patchblox.com/security/data/cve/CVE-2026-8961.md) | High | Spoofing issue in the Form Autofill component | 7.5 | 0.0032 | | | [CVE-2026-8970](https://patchblox.com/security/data/cve/CVE-2026-8970.md) | High | Privilege escalation in the Security component | 8.8 | 0.0031 | | | [CVE-2026-8963](https://patchblox.com/security/data/cve/CVE-2026-8963.md) | High | Spoofing issue in the Web Speech component | 7.5 | 0.0030 | | | [CVE-2026-8964](https://patchblox.com/security/data/cve/CVE-2026-8964.md) | High | Spoofing issue in the Popup Blocker component | 7.5 | 0.0030 | | | [CVE-2026-8969](https://patchblox.com/security/data/cve/CVE-2026-8969.md) | High | Mitigation bypass in the DOM: Security component | 8.1 | 0.0029 | | | [CVE-2026-8950](https://patchblox.com/security/data/cve/CVE-2026-8950.md) | High | Same-origin policy bypass in the Networking: HTTP component | 9.3 | 0.0019 | | | [CVE-2026-8951](https://patchblox.com/security/data/cve/CVE-2026-8951.md) | Routine | Spoofing issue in the Toolbar component in Firefox for Android | 6.5 | 0.0025 | | | [CVE-2026-8971](https://patchblox.com/security/data/cve/CVE-2026-8971.md) | Routine | Same-origin policy bypass in the Networking: JAR component | 6.5 | 0.0021 | | --- Data as of 2026-11-08T13:06:02Z UTC. 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