User Interface (UI) Misrepresentation of Critical Information Affecting Firefox package, versions [,138.0b1)


Severity

Recommended
0.0
medium
0
10

CVSS assessment by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.04% (13th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-UNMANAGED-FIREFOX-10231803
  • published23 May 2025
  • disclosed29 Apr 2025
  • creditHafiizh

Introduced: 29 Apr 2025

CVE-2025-4086  (opens in a new tab)
CWE-451  (opens in a new tab)

How to fix?

Upgrade Firefox to version 138.0b1 or higher.

Overview

Affected versions of this package are vulnerable to User Interface (UI) Misrepresentation of Critical Information due to the handling of specially crafted filenames. An attacker can obscure the type of downloaded files by encoding a large number of newline characters, potentially leading to the execution of unintended file types.

Note:

This only affects users of Firefox/Thunderbird for Android

CVSS Base Scores

version 4.0
version 3.1