Vulnerability · NVD

CVE-2025-6427

CVE-2025-6427, critical severity (CVSS 9.1): 1 tracked app concerned, all fixed or indeterminable on their current version.

Severity (CVSS): 9.1
Exploitation: -
Tracked apps: 1
Still exposed: 0

Published on 2025-06-24

An attacker was able to bypass the `connect-src` directive of a Content Security Policy by manipulating subdocuments. This would have also hidden the connections from the Network tab in Devtools. This vulnerability was fixed in Firefox 140 and Thunderbird 140.

Attack vector : Network No privileges required No user interaction

Show raw CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

Mozilla Firefox Windows winget:Mozilla.Firefox

Affected <140.0 Fixed in 140.0 Latest tracked 157.0 patched

Observed affected builds (123)

139.0.4 139.0.1 139.0 138.0.4 138.0.3 138.0.1 138.0 137.0.2 137.0.1 137.0 136.0.4 136.0.3 136.0.2 136.0.1 136.0 135.0.1 135.0 134.0.2 134.0.1 134.0 133.0.3 133.0 132.0.2 132.0.1 132.0 131.0.3 131.0.2 131.0 130.0.1 130.0 +93 · see history

Vulnerable CPE configurations (1)

Vendor	Product	Platform	Versions	CPE 2.3 URI
mozilla	firefox All platforms (wildcard)	All platforms (wildcard)	<140.0	cpe:2.3:a:mozilla:firefox:::::-:::*

View on NVD ↗ Advisory · www.mozilla.org

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