Mozilla Thunderbird (ms) 150.0
Mozilla Thunderbird (ms) 150.0, released April 21, 2026, fixes 16 CVEs in Mozilla Thunderbird (ms). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Thunderbird (ms) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Thunderbird (ms) is 159.0, which also fixes every CVE on this page. Install that instead.
Priority of the 16 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Thunderbird (ms) | 150.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-6768 | Mitigation bypass in the Networking: Cookies component | 9.8 | 0.0029 | None reported |
| Urgent | CVE-2026-6760 | Mitigation bypass in the Networking: Cookies component | 9.8 | 0.0028 | None reported |
| High | CVE-2026-6758 | Use-after-free in the JavaScript: WebAssembly component | 7.5 | 0.0081 | None reported |
| High | CVE-2026-6784 | Memory safety bugs fixed in Firefox 150 and Thunderbird 150 | 7.5 | 0.0036 | None reported |
| High | CVE-2026-6773 | Denial-of-service due to integer overflow in the Graphics: WebGPU component | 7.5 | 0.0032 | None reported |
| High | CVE-2026-6780 | Denial-of-service in the Audio/Video: Playback component | 7.5 | 0.0029 | None reported |
| High | CVE-2026-6781 | Denial-of-service in the Audio/Video: Playback component | 7.5 | 0.0029 | None reported |
| High | CVE-2026-7321 | Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component | 9.6 | 0.0026 | None reported |
| High | CVE-2026-6782 | Information disclosure in the IP Protection component | 7.5 | 0.0025 | None reported |
| Routine | CVE-2026-6778 | Invalid pointer in the Audio/Video: Playback component | 5.3 | 0.0026 | None reported |
| Routine | CVE-2026-6755 | Mitigation bypass in the DOM: postMessage component | 6.5 | 0.0025 | None reported |
| Routine | CVE-2026-6783 | Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component | 5.3 | 0.0023 | None reported |
| Routine | CVE-2026-6775 | Incorrect boundary conditions in the WebRTC component | 5.3 | 0.0021 | None reported |
| Routine | CVE-2026-6779 | Other issue in the JavaScript Engine component | 5.3 | 0.0021 | None reported |
| Routine | CVE-2026-6777 | Other issue in the Networking: DNS component | 5.3 | 0.0016 | None reported |
| Routine | CVE-2026-6774 | Mitigation bypass in the DOM: Security component | 5.4 | 0.0015 | None reported |
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