muffon has One-click Remote Code Execution via XSS and Custom URL Handling

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-55204
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-05 18:15:42 UTC
Updated2026-10-07 10:10:00 UTC
Descriptionmuffon 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.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

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

EPSS: 0.007050000 probability, percentile 0.516010000 (date 2026-10-01)

Problem Types: CWE-94 | CWE-79 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Muffon Muffon All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Staniel359 Muffon affected < 2.3.0 Not specified

References

ReferenceSourceLinkTags
drive.google.com/file/d/1eCPCQ6leuVM_vecfofFv04c0t9isCBqR/view [email protected] drive.google.com Exploit
github.com/staniel359/muffon/releases/tag/v2.3.0 [email protected] github.com Product, Release Notes
github.com/staniel359/muffon/security/advisories/GHSA-gc3f-gqph-522q [email protected] github.com Exploit, Third Party Advisory
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