CVE-2025-6431

MEDIUM 6.5

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

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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 was fixed in Firefox 140.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Jun 24, 2025
Last Updated	Apr 13, 2026

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Affected Versions

Mozilla / Firefox

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1942716 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-51/

Credits

Umar Farooq