Vulnerability record · CVE-2025-11720 · published 14 October 2025

CVE-2025-11720: Mozilla firefox vulnerability

Mozilla · Firefox

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.

8.1 CVSS 3.1 High EPSS 0.27% · top 83.0% CWE-451 · CWE-451

8.1CVSS 3.1 base score

0.27%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

3References

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Firefox Mozilla

References

Link	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1979534	Issue TrackingPermissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1984370	Issue TrackingPermissions Required
https://www.mozilla.org/security/advisories/mfsa2025-81/	Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-11720), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.