CVE-2025-11720
Spoofing risk in Android custom tabs
8.1CVSSHIGH
Description
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 was fixed in Firefox 144.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:RUser InteractionRequired
Scope
S:UScopeUnchanged
Impact
C:HConfidentialityHigh
I:HIntegrityHigh
A:NAvailabilityNone
Weaknesses
Affected Products
Exploitability
Official Patch Available
References
https://bugzilla.mozilla.org/show_bug.cgi?id=1979534
bugzilla.mozilla.org
https://bugzilla.mozilla.org/show_bug.cgi?id=1984370
bugzilla.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2025-81/
mozilla.org
and 1 more references View all →
Timeline
Published
Oct 14, 2025
Last Updated
Apr 13, 2026
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