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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1942716 permissions required
https://www.mozilla.org/security/advisories/mfsa2025-51/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-6431?
CVE-2025-6431 has been scored as a medium severity vulnerability.
How to fix CVE-2025-6431?
To fix CVE-2025-6431, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-6431 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-6431 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-6431?
CVE-2025-6431 affects Mozilla Firefox.
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