Custom Tabs Vulnerability in Firefox by Mozilla
CVE-2025-1939

3.9LOW

Key Information:

Vendor

Mozilla
Status
Firefox
Vendor
CVE Published:
4 March 2025

What is CVE-2025-1939?

A flaw in the Custom Tabs feature of Firefox enables Android applications to load web pages in a way that can deceive users. By employing a transition animation, attackers might mislead users into inadvertently granting sensitive permissions, while obscuring the true nature of the interactive elements. This poses significant risks to user data security and privacy on affected versions of Firefox.

Affected Version(s)

Firefox < 136

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1928334
https://www.mozilla.org/security/advisories/mfsa2025-14/

CVSS V3.1

Score:
3.9
Severity:
LOW
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Philipp Beer
.