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Firefox for Android CVE-2025-6431

| EUVDEUVD-2025-19087 MEDIUM
Improper Authorization (CWE-285)
2025-06-24 security@mozilla.org
Authentication Bypass Google Mozilla
6.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
vuln.today AI
6.5 MEDIUM

User interaction required to click link; bypass subverts authorization prompt, causing high integrity impact without confidentiality or availability loss.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:R/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Ubuntu
MEDIUM
qualitative
SUSE
MEDIUM
qualitative
Red Hat
3.4 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 15, 2026 - 22:36 euvd
EUVD-2025-19087
Analysis Generated
Mar 15, 2026 - 22:36 vuln.today
CVE Published
Jun 24, 2025 - 13:15 nvd
MEDIUM 6.5

DescriptionCVE.org

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.

AnalysisAI

Improper authorization bypass in Firefox for Android allows remote attackers to skip the security prompt when opening links in external applications. Affected versions prior to 140 enable crafted links to launch external apps without user consent, potentially exposing users to vulnerabilities or privacy leaks within those apps. No active exploitation or public exploit code is known, and the EPSS likelihood is very low.

Technical ContextAI

This vulnerability (CWE-285: Improper Authorization) resides in Firefox for Android's mechanism for handling links intended for external applications. By default, the browser displays a confirmation dialog before redirecting to another app. A flaw in the authorization logic allows an attacker to bypass this dialog, effectively granting unsanctioned access to external application handlers. The affected CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*, though the flaw is exclusive to the Android platform build.

RemediationAI

Upgrade to Firefox for Android version 140 or later, which contains the vendor-released patch. The update can be obtained from the Google Play Store or Mozilla's website. No workarounds are provided; upgrading is the recommended mitigation. The advisory is available at https://www.mozilla.org/security/advisories/mfsa2025-51/.

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Vendor StatusVendor

Ubuntu

Priority: Medium
firefox
Release Status Version
jammy not-affected code not present
noble not-affected code not present
oracular not-affected code not present
plucky not-affected code not present
upstream not-affected debian: Android-specific
questing not-affected code not present
thunderbird
Release Status Version
noble not-affected code not present
oracular not-affected code not present
plucky not-affected code not present
upstream needs-triage -
jammy not-affected code not present
questing not-affected code not present
mozjs38
Release Status Version
bionic needs-triage -
jammy DNE -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs52
Release Status Version
bionic ignored -
focal ignored -
jammy DNE -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs68
Release Status Version
focal ignored -
jammy DNE -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs78
Release Status Version
jammy ignored -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs91
Release Status Version
jammy ignored -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs102
Release Status Version
jammy ignored -
noble ignored -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs115
Release Status Version
jammy DNE -
noble ignored -
oracular ignored -
plucky ignored -
upstream needs-triage -
questing DNE -

Debian

firefox
Release Status Fixed Version Urgency
sid fixed 148.0.2-1 -
(unstable) not-affected - -

SUSE

Severity: Medium
Product Status
Image SLES12-SP5-SAP-Azure-LI-BYOS-Production Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP4-SAP-Azure-LI-BYOS Image SLES15-SP4-SAP-Azure-LI-BYOS-Production Image SLES15-SP4-SAP-Azure-VLI-BYOS Image SLES15-SP4-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected
SUSE Enterprise Storage 7.1 Fixed

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CVE-2025-6431 vulnerability details – vuln.today
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