# Firefox Developer Edition (en-US) 143.0

Firefox Developer Edition (en-US) 143.0, released September 5, 2025, fixes 10 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: High. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-143.0
- Platform: Windows apps
- Released: Sep 5, 2025
- Priority: High (Closes CVE-2025-10533, high severity)
- CVEs: 10, exploited: 0, on CISA KEV: 0
- Superseded by: [Firefox Developer Edition (en-US) 156.0](https://patchblox.com/security/data/product/windows-app/firefox-developer-edition-en-us.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Firefox Developer Edition (en-US)](https://patchblox.com/security/data/product/windows-app/firefox-developer-edition-en-us.md) |  | 143.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-10533](https://patchblox.com/security/data/cve/CVE-2025-10533.md) | High | Integer overflow in the SVG component | 8.8 | 0.0078 |  |
| [CVE-2025-10528](https://patchblox.com/security/data/cve/CVE-2025-10528.md) | High | Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component | 7.5 | 0.0037 |  |
| [CVE-2025-10534](https://patchblox.com/security/data/cve/CVE-2025-10534.md) | High | Spoofing issue in the Site Permissions component | 8.1 | 0.0035 |  |
| [CVE-2025-10537](https://patchblox.com/security/data/cve/CVE-2025-10537.md) | High | Memory safety bugs fixed in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143 | 8.8 | 0.0034 |  |
| [CVE-2025-10532](https://patchblox.com/security/data/cve/CVE-2025-10532.md) | High | Incorrect boundary conditions in the JavaScript: GC component | 7.5 | 0.0033 |  |
| [CVE-2025-10529](https://patchblox.com/security/data/cve/CVE-2025-10529.md) | High | Same-origin policy bypass in the Layout component | 7.5 | 0.0032 |  |
| [CVE-2025-10535](https://patchblox.com/security/data/cve/CVE-2025-10535.md) | High | Information disclosure, mitigation bypass in the Privacy component in Firefox for Android | 7.5 | 0.0031 |  |
| [CVE-2025-10536](https://patchblox.com/security/data/cve/CVE-2025-10536.md) | High | Information disclosure in the Networking: Cache component | 7.5 | 0.0018 |  |
| [CVE-2025-10530](https://patchblox.com/security/data/cve/CVE-2025-10530.md) | Routine | Spoofing issue in the WebAuthn component in Firefox for Android | 6.5 | 0.0029 |  |
| [CVE-2025-10531](https://patchblox.com/security/data/cve/CVE-2025-10531.md) | Routine | Mitigation bypass in the Web Compatibility: Tooling component | 5.4 | 0.0027 |  |

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Data as of 2026-11-08T13:06:02Z 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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