CVE-2025-55204CRITICAL 9.6EPSS p43.0%

CVE-2025-55204CVE-2025-55204

Description

muffon is a cross-platform music streaming client for desktop. Versions prior to 2.3.0 have a one-click Remote Code Execution (RCE) vulnerability in. An attacker can exploit this issue by embedding a specially crafted `muffon://` link on any website they control. When a victim visits the site or clicks the link, the browser triggers Muffon’s custom URL handler, causing the application to launch and process the URL. This leads to RCE on the victim's machine without further interaction. Version 2.3.0 patches the issue.

Scoring

CVSS 3.19.6 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS0.58% probability of exploitation · percentile 43.0% · 2026-06-18T12:00:27Z
Published2026-01-05
Last modified2026-01-12

Underlying weaknesses· 2

CWE-94CWE-79

References

  1. https://drive.google.com/file/d/1eCPCQ6leuVM_vecfofFv04c0t9isCBqR/view?usp=sharing
  2. https://github.com/staniel359/muffon/releases/tag/v2.3.0
  3. https://github.com/staniel359/muffon/security/advisories/GHSA-gc3f-gqph-522q

2

TypeTargetConfidenceTier
WeaknessImproper Neutralization of Input During Web Page Generation ('Cross-site Scripting')cwe-790%live
WeaknessImproper Control of Generation of Code ('Code Injection')cwe-940%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.