CVE-2025-11720

Name: CVE-2025-11720
Creator: NVD / NIST
Published: 2025-10-14T13:15:38.4+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.24%

Last modified Jun 17, 2026

CVE-2025-11720 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 0.24% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

0.24%

15.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-451

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 144.0

References

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

Timeline

Published: Oct 14, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-11720?

How severe is CVE-2025-11720?

CVE-2025-11720 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2025-11720?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-11720?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST