CVE-2026-53908

UNKNOWN 0.0

User Enumeration in MCO

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

MCO is vulnerable to User Enumeration through authentication-related functionalities. The application returns distinguishable responses for valid and invalid users during username reminder and password reset operations. An attacker can leverage these differences to enumerate valid usernames and email addresses. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.

CWE	CWE-204
Vendor	mycomplianceoffice
Product	mco
Published	Jul 1, 2026
Last Updated	Jul 1, 2026

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Affected Versions

MyComplianceOffice / MCO

25.3.3.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

cert.pl: https://cert.pl/en/posts/2026/07/CVE-2026-53902 mco.mycomplianceoffice.com: https://mco.mycomplianceoffice.com/

Credits

Hubert Decyusz (AFINE Team)