CVE-2025-3839 HIGH

CVE-2025-3839: Epiphany: insecure external protocol invocation in epiphany

Weakness CWE-356
Published January 23, 2026
Last update January 23, 2026

CVSS base score

8.0/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minimal user interaction. This design can be misused to exploit vulnerabilities within those handlers, making them appear remotely exploitable. The browser fails to properly warn or gate this action, resulting in potential code execution on the client device via trusted UI behavior.

Key dates

02Disclosure timeline

January 23, 2026 CVE published
January 23, 2026 Record updated