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CVE-2025-6427

—
CVSS 3.1
9.1 critical
EPSS
<1%p25
Published
()
Modified
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.

Vendors
mozilla
Products
firefox
Weakness
CWE-693
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD CVE.org GitHub PoCs EPSS (0.3%)

In the news

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