VULNERABILITY INTELLIGENCE

CVE-2025-6427

CVSS score9.1 CRITICAL
EPSS probability0.37%
CISA KEVNot currently listed
Published2025-06-24
Last modified2026-09-30
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Description

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.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-693

Primary references