CVE-2025-11720 Spoofing risk in Android custom tabs
Attackers can spoof subdomains in Android custom tabs by hiding the full hostname, misleading users about the site's origin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-11720?
CVE-2025-11720 is a high-severity vulnerability in Mozilla Firefox, published on 14 Oct 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-451
Which versions are affected by CVE-2025-11720?
It affects 1 product.
Products include Mozilla Firefox.
How do I fix CVE-2025-11720?
Upgrade to a fixed version.
Is CVE-2025-11720 being exploited?
There is no known exploitation of CVE-2025-11720 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-wjv8-8vf9-mrv8, UBUNTU-CVE-2025-11720.