CVE-2025-14331 — Origin Validation Error in Mozilla Firefox

CWE-346 — Origin Validation Error13 documents9 sources
Severity
6.5MEDIUMNVD
EPSS
0.0%
top 86.45%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla ThunderbirdMozilla Firefox
Timeline
PublishedDec 9
Latest updateFeb 2

Description

Same-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NExploitability: 3.9 | Impact: 2.5

Affected Packages3 packages

▶NVDmozilla/firefox116.0 — 140.6.0+2
▶NVDmozilla/thunderbird< 140.6.0+1
▶Debianmozilla/thunderbird< 1:140.6.0esr-1~deb11u1+3

🔴Vulnerability Details

3
GHSA
GHSA-pq76-9m6x-m6mx: Same-origin policy bypass in the Request Handling component↗2025-12-09
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CVEList
Same-origin policy bypass in the Request Handling component↗2025-12-09
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OSV
CVE-2025-14331: Same-origin policy bypass in the Request Handling component↗2025-12-09
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📋Vendor Advisories

8
Ubuntu
Thunderbird vulnerabilities↗2026-02-02
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Red Hat
firefox: thunderbird: Same-origin policy bypass in the Request Handling component↗2025-12-09
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Debian
CVE-2025-14331: firefox - Same-origin policy bypass in the Request Handling component. This vulnerability ...↗2025
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Mozilla
Mozilla Foundation Security Advisory 2025-95: CVE-2025-14331↗
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Mozilla
Mozilla Foundation Security Advisory 2025-92: CVE-2025-14331↗
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🕵️Threat Intelligence

1
Wiz
CVE-2025-14331 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2025-14331 — Origin Validation Error in Mozilla | cvebase