CVE-2025-10531
Medium
Description
Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.
SeverityMedium
CVSS5.4
Exploit probability—
Product
Mozilla Firefox
PublishedSep 16, 2025
First seenSep 16, 2025
Weakness typeCWE-288CWE-288
How to fix
Update
- mozilla firefox143.0 or later
- mozilla thunderbird143.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 143.0 | 143.0 |
| mozilla thunderbird | v < 143.0 | 143.0 |
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