Custom URL Protocol Handler Vulnerability in Firefox Browser by Mozilla
CVE-2025-1935

4.3MEDIUM

Key Information:

Vendor
Mozilla
Status
Firefox
Firefox Esr
Vendor
CVE Published:
4 March 2025

Summary

A security issue exists that may enable a malicious web page to convince a user to set that page as the default handler for a custom URL protocol. This could lead to unintended actions being taken when a user attempts to use that protocol, potentially compromising user privacy and security. Affected versions include Firefox versions prior to 136 and Firefox ESR versions before 128.8.

Affected Version(s)

Firefox < 136

Firefox ESR < 128.8

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1866661
https://www.mozilla.org/security/advisories/mfsa2025-14/
https://www.mozilla.org/security/advisories/mfsa2025-16/

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Hafiizh
.