CVE-2025-11720

HIGH 8.1

Spoofing risk in Android custom tabs

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Oct 14, 2025
Last Updated	Apr 13, 2026

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Affected Versions

Mozilla / Firefox

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1979534 bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1984370 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-81/

Credits

Michel Le Bihan