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This vulnerability in Mustangproject versions before 2.16.3 involves XML External Entity (XXE) attacks. Attackers can craft malicious XML inputs that include external entity references. When the application parses such XML without proper security settings, it can lead to the disclosure of internal files. Specifically, by defining an external entity that points to a file on the server, such as /etc/passwd, and then referencing that entity in the XML, the attacker can exfiltrate the content of that file in the response. This is possible because the XML parser is configured to resolve external entities, which can be abused to read local files. The vulnerability is due to insecure default settings or lack of input validation in the XML processing components of Mustangproject. The impact is limited to file disclosure, which may include sensitive configuration files or source code, depending on the server setup. However, the severity is low because it requires specific conditions and may not lead to remote code execution. The fix in version 2.16.3 likely involves disabling external entity resolution or implementing secure parsing practices.
Platform: Mustangproject
Version: before 2.16.3
Vulnerability: XXE
Severity: low
date: Nov 28, 2025
Prediction: Patch released Dec 1, 2025
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curl -X POST -H “Content-Type: application/xml” -d ‘]>
xxeinjector -u http://target -data xml_payload.txt
python3 xxe_detector.py –url http://target.com/api
how Exploit:
Craft malicious XML with external entities referencing local files like file:///etc/passwd. Send via HTTP POST to vulnerable endpoints. Extract file contents from response.
Protection from this CVE
Disable external entity resolution in XML parsers. Use secure parsing libraries. Implement input validation and sanitization.
Impact:
File disclosure risks. Potential sensitive data exposure. Low severity due to limited scope.
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Reported By: github.com
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