High 8.1Published Oct 14, 2025

CVE-2025-11720Spoofing risk in Android custom tabs

Updated under an hour ago (Oct 27, 2026, 6:40 PM ET)

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It affects Mozilla Firefox. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 8.1 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-451
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mozilla
NVD analysis: Modified
Record last updated: Apr 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Mozilla Firefox mozilla:firefox (from the name)	from 144 not affected	CNA record
mozilla firefox mozilla:firefox	before 144.0	NVD

References

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1979534	issue-tracking, permissions-required
https://bugzilla.mozilla.org/show_bug.cgi?id=1984370	issue-tracking, permissions-required
https://www.mozilla.org/security/advisories/mfsa2025-81/	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.