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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.
Reserved 2025-06-20 | Published 2025-06-24 | Updated 2025-06-24 | Assigner mozillaconnect-src Content Security Policy restriction could be bypassed
Alan Li (lebr0nli)
bugzilla.mozilla.org/show_bug.cgi?id=1966927
www.mozilla.org/security/advisories/mfsa2025-51/
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