What is CVE-2025-6431?

CVE-2025-6431 is a medium-severity vulnerability in Google Android, classified under Improper Authorization. CVSS score: 6.5/10. Published 2025-06-24.

How severe is CVE-2025-6431?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Google Android

CVE-2025-6431

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.

EPSS: 0.002 (11.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

Affected products

Google Android
Mozilla Firefox — versions 140

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

security@mozilla.org (Permissions Required)
security@mozilla.org (Vendor Advisory)

Frequently asked questions

What is CVE-2025-6431?: CVE-2025-6431 is a medium-severity vulnerability in Google Android, classified under Improper Authorization. CVSS score: 6.5/10. Published 2025-06-24.
How severe is CVE-2025-6431?: Medium severity. CVSS v3 base score is 6.5 out of 10.