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.
Superseded. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every CVE on this page. Install that instead.
Priority of the 10 CVEs
Applies to
| Product | Version |
|---|---|
| Firefox Developer Edition (en-US) | 143.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2025-10533 | Integer overflow in the SVG component | 8.8 | 0.0078 | None reported |
| High | CVE-2025-10528 | Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component | 7.5 | 0.0037 | None reported |
| High | CVE-2025-10534 | Spoofing issue in the Site Permissions component | 8.1 | 0.0035 | None reported |
| High | CVE-2025-10537 | Memory safety bugs fixed in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143 | 8.8 | 0.0034 | None reported |
| High | CVE-2025-10532 | Incorrect boundary conditions in the JavaScript: GC component | 7.5 | 0.0033 | None reported |
| High | CVE-2025-10529 | Same-origin policy bypass in the Layout component | 7.5 | 0.0032 | None reported |
| High | CVE-2025-10535 | Information disclosure, mitigation bypass in the Privacy component in Firefox for Android | 7.5 | 0.0031 | None reported |
| High | CVE-2025-10536 | Information disclosure in the Networking: Cache component | 7.5 | 0.0018 | None reported |
| Routine | CVE-2025-10530 | Spoofing issue in the WebAuthn component in Firefox for Android | 6.5 | 0.0029 | None reported |
| Routine | CVE-2025-10531 | Mitigation bypass in the Web Compatibility: Tooling component | 5.4 | 0.0027 | None reported |
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