CVE-2025-11720: firefox — Fix

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.

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CVSS v3.1 Score

8.1

HIGH

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

Weakness Type (CWE)

CWE-451 CWE-451

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 144.0
google	android	All

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-81/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1979534 https://bugzilla.mozilla.org/show_bug.cgi?id=1984370

Frequently Asked Questions

What is CVE-2025-11720? +

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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2025-11720? +

CVE-2025-11720 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-11720? +

CVE-2025-11720 affects products from google, mozilla, specifically: android, firefox. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-11720? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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