CVE-2025-11720

The Firefox and Firefox Focus UI for the Android custom tab feature only showed the "site" that was loaded, not the full hostname. User supplied content hosted on a subdomain of a site could have been used to fool a user into thinking it was content from a different subdomain of that site. This vulnerability affects Firefox < 144.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
UNKNOWN
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mozillaCNA
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Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
143.0.3-1
fixed
Vulnerability Media Exposure
References
https://bugzilla.mozilla.org/show_bug.cgi?id=1979534
https://bugzilla.mozilla.org/show_bug.cgi?id=1984370
https://www.mozilla.org/security/advisories/mfsa2025-81/