CVE-2025-66372: mustangproject Mustang · XML External Entity (XXE)
Affects mustangproject MustangSource CVE Database V5
Not known to be exploited · CVSS 2.8 Low : upgrade to 2.16.3 when convenient.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 2.16.3
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:NExploitation evidence
Disclosed: evidence found.
CVE published 28 Nov 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade zugferd/mustangproject to 2.16.3.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
GitHubzugferd/mustangprojectpkg:github/zugferd/mustangprojectOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
- Upgrade Mustang to version 2.16.3 or later, where the XXE vulnerability has been addressed by properly restricting XML external entity processing.
- Implement strict access controls to limit local access to systems running Mustang, reducing the risk of an attacker gaining the necessary privileges to exploit the vulnerability.
- Employ application whitelisting and endpoint protection to detect and prevent unauthorized execution of malicious code that could leverage this flaw.
- Conduct regular security audits and code reviews of XML processing components to ensure no other XXE or related vulnerabilities exist.
- Use XML parsers and libraries configured with secure defaults that disable external entity resolution unless explicitly required and validated.
- Monitor logs and network traffic for unusual file access patterns or exfiltration attempts related to Mustang usage.
- Educate developers and system administrators about the risks of XXE and secure XML handling best practices to prevent similar vulnerabilities in the future.
Description
Mustang before 2.16.3 allows exfiltrating files via XXE attacks.