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VulnerabilityPublished Updated

CVE-2025-66372: mustangproject Mustang · XML External Entity (XXE)

Affects mustangproject MustangSource CVE Database V5

0

Not known to be exploited · CVSS 2.8 Low : upgrade to 2.16.3 when convenient.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
2.8Low
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 Nov 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
GitHubzugferd/mustangprojectpkg:github/zugferd/mustangprojectOther threatsAffected
  • <2.16.3
Fixed in
  • 2.16.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

  1. Upgrade Mustang to version 2.16.3 or later, where the XXE vulnerability has been addressed by properly restricting XML external entity processing.
  2. 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.
  3. Employ application whitelisting and endpoint protection to detect and prevent unauthorized execution of malicious code that could leverage this flaw.
  4. Conduct regular security audits and code reviews of XML processing components to ensure no other XXE or related vulnerabilities exist.
  5. Use XML parsers and libraries configured with secure defaults that disable external entity resolution unless explicitly required and validated.
  6. Monitor logs and network traffic for unusual file access patterns or exfiltration attempts related to Mustang usage.
  7. 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.

References

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