CVE-2025-10531 — Authentication Bypass Using an Alternate Path or Channel in Mozilla Firefox

CWE-288 — Authentication Bypass Using an Alternate Path or Channel8 documents7 sources
Severity
5.4MEDIUMNVD
EPSS
0.0%
top 91.45%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedSep 16

Description

Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:NExploitability: 2.8 | Impact: 2.5

Affected Packages2 packages

▶NVDmozilla/firefox< 143.0
▶NVDmozilla/thunderbird< 143.0

🔴Vulnerability Details

3
CVEList
Mitigation bypass in the Web Compatibility: Tooling component↗2025-09-16
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GHSA
GHSA-h6qg-7fq8-gw5h: This vulnerability affects Firefox < 143 and Thunderbird < 143↗2025-09-16
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OSV
CVE-2025-10531: Mitigation bypass in the Web Compatibility: Tooling component↗2025-09-16
▶

📋Vendor Advisories

4
Red Hat
firefox: Mitigation bypass in the Web Compatibility: Tooling component↗2025-09-16
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Debian
CVE-2025-10531: firefox - Mitigation bypass in the Web Compatibility: Tooling component. This vulnerabilit...↗2025
▶
Mozilla
Mozilla Foundation Security Advisory 2025-73: CVE-2025-10531↗
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Mozilla
Mozilla Foundation Security Advisory 2025-77: CVE-2025-10531↗
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CVE-2025-10531 — Mozilla Firefox vulnerability | cvebase