CVE-2025-55204
Remote Code Execution in Muffon via Malicious URL Handler
Publication date: 2026-01-05
Last updated on: 2026-01-05
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| staniel359 | muffon | to 2.3.0 (exc) |
| staniel359 | muffon | 2.3.0 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-94 | The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2025-55204 is a high-severity Remote Code Execution (RCE) vulnerability in Muffon versions prior to 2.3.0. It arises from multiple Cross-Site Scripting (XSS) flaws combined with insecure handling of Muffon's custom URL scheme (muffon://). Attackers can embed specially crafted muffon:// links on websites they control. When a victim clicks or visits such a link, the browser launches Muffon and loads an internal page containing malicious XSS payloads without the user's awareness. These payloads exploit Electron APIs to execute arbitrary code on the victim's machine, enabling one-click RCE without further interaction. [3]
How can this vulnerability impact me? :
This vulnerability can lead to Remote Code Execution on your machine without your further interaction beyond clicking or visiting a malicious link. An attacker can execute arbitrary files or code on your system, potentially compromising confidentiality, integrity, and availability of your data and system. This could result in unauthorized access, data theft, system manipulation, or disruption of services. [3]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
Detection can focus on monitoring for usage or invocation of the custom URL scheme 'muffon://' which triggers the vulnerable application. On a system, you can check if Muffon versions prior to 2.3.0 are installed. Network detection could involve monitoring HTTP traffic for suspicious 'muffon://' links being accessed or delivered. Specific commands might include searching browser history or logs for 'muffon://' URLs, or checking installed Muffon version via command line. For example, on Linux, you might run 'muffon --version' or check package manager info. However, no explicit detection commands are provided in the resources. [3]
What immediate steps should I take to mitigate this vulnerability?
The immediate mitigation step is to upgrade Muffon to version 2.3.0 or later, as this version patches the vulnerability. Additionally, avoid clicking on or visiting untrusted websites that may contain malicious 'muffon://' links. If possible, disable or restrict the handling of the 'muffon://' custom URL scheme until the update is applied. [3, 1]
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided resources do not contain information regarding the impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.