CVE-2025-55204

CRITICALNVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.6 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 54% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.6Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.6
EG Score
9.6(medium)
EG Risk
59(Track*)
EG Risk 59/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity96% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

January 5, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github.
github Patch Available🟡 PoC Available

One-click Remote Code Execution via XSS and Custom URL Handling in Muffon v2.2.0 · Advisory · staniel359/muffon · GitHub

https://github.com/staniel359/muffon/security/advisories/GHSA-gc3f-gqph-522q
github_release Patch Available

2.3.0

Patch available: staniel359/muffon v2.3.0

https://github.com/staniel359/muffon/releases/tag/v2.3.0
generic

poc-muffon-rce.mov - Google Drive

https://drive.google.com/file/d/1eCPCQ6leuVM_vecfofFv04c0t9isCBqR/view?usp=sharing

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 158 total refreshes for this CVE.

  1. 2026-09-21 21:06 UTCEPSS rescore
  2. 2026-09-20 20:15 UTCEPSS rescore
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  4. 2026-09-19 19:03 UTCOSV refresh
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  27. 2026-08-07 16:26 UTCEPSS rescore
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  29. 2026-08-06 06:22 UTCEG score recompute▲ 0.80
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  44. 2026-07-23 11:19 UTCOSV refresh
  45. 2026-07-23 02:59 UTCEG score recompute
  46. 2026-07-22 14:08 UTCEPSS rescore
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  74. 2026-07-04 06:30 UTCEPSS rescore
  75. 2026-07-02 17:01 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2025-55204?
CVE-2025-55204 is a critical vulnerability published on January 5, 2026. 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…
When was CVE-2025-55204 disclosed?
CVE-2025-55204 was first published in the National Vulnerability Database on January 5, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-55204 actively exploited?
CVE-2025-55204 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.1% of all scored CVEs.
What is the CVSS score of CVE-2025-55204?
CVE-2025-55204 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2025-55204?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-55204, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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