CVE-2025-3839

Name: CVE-2025-3839
Creator: NVD / NIST
Published: 2026-01-23T05:16:21.753+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8/10EPSS 0.38%

Last modified Jun 17, 2026

CVE-2025-3839 is a high-severity vulnerability rated 8/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8/10

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

EPSS Probability

0.38%

30.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-356

References

Timeline

Published: Jan 23, 2026
Last Modified: Jun 17, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2025-3839?

How severe is CVE-2025-3839?

CVE-2025-3839 has a CVSS score of 8/10 (HIGH severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.

How do I fix CVE-2025-3839?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-3839?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST