Vulnerability · Published Jan 5, 2026 · Assigned by GitHub_M
CVE-2025-55204muffon has One-click Remote Code Execution via XSS and Custom URL Handling
High 8.8
In plain English
A high-severity code injection in muffon from staniel359. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| staniel359 | muffon | < 2.3.0 |
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://github.com/staniel359/muffon/security/advisories/GHSA-gc3f-gqph-522q x_refsource_CONFIRM
- https://drive.google.com/file/d/1eCPCQ6leuVM_vecfofFv04c0t9isCBqR/view?usp=sharing x_refsource_MISC
- https://github.com/staniel359/muffon/releases/tag/v2.3.0 x_refsource_MISC