# Mozilla Thunderbird (de) 150.0

Mozilla Thunderbird (de) 150.0, released April 21, 2026, fixes 16 CVEs in Mozilla Thunderbird (de). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Thunderbird (de) is 159.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.de-150.0
- Platform: Windows apps
- Released: Apr 21, 2026
- Priority: Urgent (Closes CVE-2026-6768, rated Critical)
- CVEs: 16, exploited: 0, on CISA KEV: 0
- Superseded by: [Mozilla Thunderbird (de) 159.0](https://patchblox.com/security/data/product/windows-app/mozilla-thunderbird-de.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Mozilla Thunderbird (de)](https://patchblox.com/security/data/product/windows-app/mozilla-thunderbird-de.md) |  | 150.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [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-2026-6758](https://patchblox.com/security/data/cve/CVE-2026-6758.md) | High | Use-after-free in the JavaScript: WebAssembly component | 7.5 | 0.0081 |  |
| [CVE-2026-6784](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-2026-6773](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-2026-6780](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-2026-7321](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-2026-6782](https://patchblox.com/security/data/cve/CVE-2026-6782.md) | High | Information disclosure in the IP Protection component | 7.5 | 0.0025 |  |
| [CVE-2026-6778](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-2026-6783](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-2026-6777](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 |  |

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Data as of 2026-11-09T19:38:12Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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