# Firefox Developer Edition (rm) 151.0 Firefox Developer Edition (rm) 151.0, released May 13, 2026, fixes 88 CVEs in Firefox Developer Edition (rm). None of them is reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.rm-151.0 - Platform: Windows apps - Released: May 13, 2026 - Priority: Urgent (Closes CVE-2026-8948, rated Critical) - CVEs: 88, exploited: 0, on CISA KEV: 0 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Firefox Developer Edition (rm)](https://patchblox.com/security/data/product/windows-app/firefox-developer-edition-rm.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-2026-6768](https://patchblox.com/security/data/cve/CVE-2026-6768.md) | Urgent | Mitigation bypass in the Networking: Cookies component | 9.8 | 0.0029 | | | [CVE-2026-6760](https://patchblox.com/security/data/cve/CVE-2026-6760.md) | Urgent | Mitigation bypass in the Networking: Cookies component | 9.8 | 0.0028 | | | [CVE-2026-5735](https://patchblox.com/security/data/cve/CVE-2026-5735.md) | Urgent | Memory safety bugs fixed in Firefox 149.0.2 and Thunderbird 149.0.2 | 9.8 | 0.0027 | | | [CVE-2026-6770](https://patchblox.com/security/data/cve/CVE-2026-6770.md) | High | Other issue in the Storage: IndexedDB component | 8.8 | 0.0388 | | | [CVE-2026-6746](https://patchblox.com/security/data/cve/CVE-2026-6746.md) | High | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0095 | | | [CVE-2026-6758](https://patchblox.com/security/data/cve/CVE-2026-6758.md) | High | Use-after-free in the JavaScript: WebAssembly component | 7.5 | 0.0081 | | | [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-2026-6785](https://patchblox.com/security/data/cve/CVE-2026-6785.md) | High | Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 | 8.8 | 0.0051 | | | [CVE-2026-6786](https://patchblox.com/security/data/cve/CVE-2026-6786.md) | High | Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 | 8.8 | 0.0050 | | | [CVE-2026-8390](https://patchblox.com/security/data/cve/CVE-2026-8390.md) | High | Use-after-free in the JavaScript: WebAssembly component | 7.3 | 0.0050 | | | [CVE-2026-6757](https://patchblox.com/security/data/cve/CVE-2026-6757.md) | High | Invalid pointer in the JavaScript: WebAssembly component | 8.8 | 0.0049 | | | [CVE-2026-6750](https://patchblox.com/security/data/cve/CVE-2026-6750.md) | High | Privilege escalation in the Graphics: WebRender component | 8.8 | 0.0048 | | | [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-2026-8389](https://patchblox.com/security/data/cve/CVE-2026-8389.md) | High | JIT miscompilation in the JavaScript Engine: JIT component | 8.8 | 0.0042 | | | [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-2026-6749](https://patchblox.com/security/data/cve/CVE-2026-6749.md) | High | Information disclosure due to uninitialized memory in the Graphics: Canvas2D component | 8.8 | 0.0040 | | | [CVE-2026-6747](https://patchblox.com/security/data/cve/CVE-2026-6747.md) | High | Use-after-free in the WebRTC component | 8.8 | 0.0040 | | | [CVE-2026-6748](https://patchblox.com/security/data/cve/CVE-2026-6748.md) | High | Uninitialized memory in the Audio/Video: Web Codecs component | 9.8 | 0.0040 | | | [CVE-2026-6772](https://patchblox.com/security/data/cve/CVE-2026-6772.md) | High | Incorrect boundary conditions in the Libraries component in NSS | 8.8 | 0.0039 | | | [CVE-2026-6754](https://patchblox.com/security/data/cve/CVE-2026-6754.md) | High | Use-after-free in the JavaScript Engine component | 8.8 | 0.0039 | | | [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-2026-7323](https://patchblox.com/security/data/cve/CVE-2026-7323.md) | High | Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1 | 8.8 | 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-2026-5732](https://patchblox.com/security/data/cve/CVE-2026-5732.md) | High | Incorrect boundary conditions, integer overflow in the Graphics: Text component | 8.8 | 0.0036 | | | [CVE-2026-6759](https://patchblox.com/security/data/cve/CVE-2026-6759.md) | High | Use-after-free in the Widget: Cocoa component | 8.8 | 0.0036 | | | [CVE-2026-6784](https://patchblox.com/security/data/cve/CVE-2026-6784.md) | High | Memory safety bugs fixed in Firefox 150 and Thunderbird 150 | 7.5 | 0.0036 | | | [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-2026-5734](https://patchblox.com/security/data/cve/CVE-2026-5734.md) | High | Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 | 9.8 | 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-2026-6773](https://patchblox.com/security/data/cve/CVE-2026-6773.md) | High | Denial-of-service due to integer overflow in the Graphics: WebGPU component | 7.5 | 0.0032 | | | [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-2026-7320](https://patchblox.com/security/data/cve/CVE-2026-7320.md) | High | Information disclosure due to incorrect boundary conditions in the Audio/Video component | 8.8 | 0.0032 | | | [CVE-2026-8093](https://patchblox.com/security/data/cve/CVE-2026-8093.md) | High | Memory safety bugs fixed in Thunderbird 150.0.2 | 8.1 | 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-2026-8090](https://patchblox.com/security/data/cve/CVE-2026-8090.md) | High | Use-after-free in the DOM: Networking component | 7.5 | 0.0032 | | | [CVE-2026-7322](https://patchblox.com/security/data/cve/CVE-2026-7322.md) | High | Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1 | 8.8 | 0.0032 | | | [CVE-2026-5733](https://patchblox.com/security/data/cve/CVE-2026-5733.md) | High | Incorrect boundary conditions in the Graphics: WebGPU component | 8.8 | 0.0032 | | | [CVE-2026-8401](https://patchblox.com/security/data/cve/CVE-2026-8401.md) | High | Sandbox escape in the Profile Backup component | 9.8 | 0.0031 | | | [CVE-2026-6771](https://patchblox.com/security/data/cve/CVE-2026-6771.md) | High | Mitigation bypass in the DOM: Security component | 9.8 | 0.0031 | | | [CVE-2026-6751](https://patchblox.com/security/data/cve/CVE-2026-6751.md) | High | Uninitialized memory in the Audio/Video: Web Codecs component | 8.8 | 0.0031 | | | [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-2026-6752](https://patchblox.com/security/data/cve/CVE-2026-6752.md) | High | Incorrect boundary conditions in the WebRTC component | 8.8 | 0.0031 | | | [CVE-2026-6753](https://patchblox.com/security/data/cve/CVE-2026-6753.md) | High | Incorrect boundary conditions in the WebRTC 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-2026-7324](https://patchblox.com/security/data/cve/CVE-2026-7324.md) | High | Memory safety bugs fixed in Thunderbird 150.0.1 | 7.3 | 0.0030 | | | [CVE-2026-8391](https://patchblox.com/security/data/cve/CVE-2026-8391.md) | High | Other issue in the JavaScript Engine component | 7.5 | 0.0030 | | | [CVE-2026-6780](https://patchblox.com/security/data/cve/CVE-2026-6780.md) | High | Denial-of-service in the Audio/Video: Playback component | 7.5 | 0.0029 | | | [CVE-2026-6781](https://patchblox.com/security/data/cve/CVE-2026-6781.md) | High | Denial-of-service in the Audio/Video: Playback component | 7.5 | 0.0029 | | | [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-2026-6756](https://patchblox.com/security/data/cve/CVE-2026-6756.md) | High | Mitigation bypass in Firefox for Android | 7.5 | 0.0027 | | | [CVE-2026-7321](https://patchblox.com/security/data/cve/CVE-2026-7321.md) | High | Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component | 9.6 | 0.0026 | | | [CVE-2026-6766](https://patchblox.com/security/data/cve/CVE-2026-6766.md) | High | Incorrect boundary conditions in the Libraries component in NSS | 8.8 | 0.0026 | | | [CVE-2026-6782](https://patchblox.com/security/data/cve/CVE-2026-6782.md) | High | Information disclosure in the IP Protection component | 7.5 | 0.0025 | | | [CVE-2026-8388](https://patchblox.com/security/data/cve/CVE-2026-8388.md) | High | Incorrect boundary conditions in the JavaScript Engine: JIT component | 7.5 | 0.0024 | | | [CVE-2026-6764](https://patchblox.com/security/data/cve/CVE-2026-6764.md) | High | Incorrect boundary conditions in the DOM: Device Interfaces component | 8.8 | 0.0023 | | | [CVE-2026-6767](https://patchblox.com/security/data/cve/CVE-2026-6767.md) | High | Other issue in the Libraries component in NSS | 8.8 | 0.0023 | | | [CVE-2026-6769](https://patchblox.com/security/data/cve/CVE-2026-6769.md) | High | Privilege escalation in the Debugger component | 8.8 | 0.0023 | | | [CVE-2026-6761](https://patchblox.com/security/data/cve/CVE-2026-6761.md) | High | Privilege escalation in the Networking component | 8.8 | 0.0022 | | | [CVE-2026-6765](https://patchblox.com/security/data/cve/CVE-2026-6765.md) | High | Information disclosure in the Form Autofill component | 8.8 | 0.0022 | | | [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-2026-6763](https://patchblox.com/security/data/cve/CVE-2026-6763.md) | High | Mitigation bypass in the File Handling component | 8.8 | 0.0019 | | | [CVE-2026-6762](https://patchblox.com/security/data/cve/CVE-2026-6762.md) | High | Spoofing issue in the DOM: Core & HTML component | 8.8 | 0.0019 | | | [CVE-2026-6776](https://patchblox.com/security/data/cve/CVE-2026-6776.md) | High | Incorrect boundary conditions in the WebRTC: Networking component | 8.8 | 0.0011 | | | [CVE-2026-6778](https://patchblox.com/security/data/cve/CVE-2026-6778.md) | Routine | Invalid pointer in the Audio/Video: Playback component | 5.3 | 0.0026 | | | [CVE-2026-6755](https://patchblox.com/security/data/cve/CVE-2026-6755.md) | Routine | Mitigation bypass in the DOM: postMessage component | 6.5 | 0.0025 | | | [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-2026-6783](https://patchblox.com/security/data/cve/CVE-2026-6783.md) | Routine | Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component | 5.3 | 0.0023 | | | [CVE-2026-6775](https://patchblox.com/security/data/cve/CVE-2026-6775.md) | Routine | Incorrect boundary conditions in the WebRTC component | 5.3 | 0.0021 | | | [CVE-2026-6779](https://patchblox.com/security/data/cve/CVE-2026-6779.md) | Routine | Other issue in the JavaScript Engine component | 5.3 | 0.0021 | | | [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 | | | [CVE-2026-6777](https://patchblox.com/security/data/cve/CVE-2026-6777.md) | Routine | Other issue in the Networking: DNS component | 5.3 | 0.0016 | | | [CVE-2026-6774](https://patchblox.com/security/data/cve/CVE-2026-6774.md) | Routine | Mitigation bypass in the DOM: Security component | 5.4 | 0.0015 | | --- Data as of 2026-11-08T19:12:23Z UTC. 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