CVE-2025-6431

Description

When a link can be opened in an external application, Firefox for Android will, by default, prompt the user before doing so. An attacker could have bypassed this prompt, potentially exposing the user to security vulnerabilities or privacy leaks in external applications. *This bug only affects Firefox for Android. Other versions of Firefox are unaffected.* This vulnerability affects Firefox < 140.

Reserved 2025-06-20 | Published 2025-06-24 | Updated 2025-06-24 | Assigner mozilla

Problem types

The prompt in Firefox for Android that asks before opening a link in an external application could be bypassed

Product status

Any version before 140
affected

Credits

Umar Farooq

References

bugzilla.mozilla.org/show_bug.cgi?id=1942716

www.mozilla.org/security/advisories/mfsa2025-51/

cve.org (CVE-2025-6431)

nvd.nist.gov (CVE-2025-6431)

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