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 affects Firefox < 144.
Problem types
Spoofing risk in Android custom tabs
Product status
Credits
Michel Le Bihan
References
bugzilla.mozilla.org/show_bug.cgi?id=1979534
bugzilla.mozilla.org/show_bug.cgi?id=1984370
www.mozilla.org/security/advisories/mfsa2025-81/
