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.

Published 2025-06-24 · last modified 2026-09-30.

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.

EPSS exploit prediction

EPSS: 0.003 (14.9th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000

Affected products

Google Android
Mozilla Firefox — versions 140

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
www.mozilla.org/security/advisories/mfsa2025-51/ (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.