RCE in Muffon
CVE-2025-55204
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000
Affected products
- Muffon
- Staniel359 Muffon — versions < 2.3.0
Weakness classification (CWE)
References
- github.com/staniel359/muffon/security/advisories/GHSA-gc3f-gqph-522q (Exploit, Third Party Advisory)
- drive.google.com/file/d/1eCPCQ6leuVM_vecfofFv04c0t9isCBqR/view (Exploit)
- github.com/staniel359/muffon/releases/tag/v2.3.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2025-55204?
- CVE-2025-55204 is a high-severity vulnerability in Muffon, classified under Code Injection. CVSS score: 8.8/10. Published 2026-01-05.
- How severe is CVE-2025-55204?
- High severity. CVSS v3 base score is 8.8 out of 10.