CVE-2025-11720
Last modified
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/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness Enumeration
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
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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