CVE-2025-6431

MEDIUM

Firefox for Android < 140.0 - Improper Authorization via External Application Link Handling

Title source: llm

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 was fixed in Firefox 140.

References (2)

Core 2

Core References

Permissions Required

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

Vendor Advisory

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

Scores

CVSS v3 6.5

EPSS 0.0018

EPSS Percentile 39.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-285

Status published

Products (2)

mozilla/firefox < 140.0

Mozilla/Firefox 140

Published Jun 24, 2025

Tracked Since Feb 18, 2026