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 affects Firefox < 140.
https://www.mozilla.org/security/advisories/mfsa2025-51/
https://bugzilla.mozilla.org/show_bug.cgi?id=1966927
Source: Mitre, NVD
Published: 2025-06-24
Updated: 2025-06-25
Base Score: 7.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
Severity: High
Base Score: 9.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Severity: Critical
EPSS: 0.00018