Vulnerability in Mycomplianceoffice Mco

CVE-2026-53908

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.

EPSS: 0.002 (11.5th percentile) — read the EPSS interpretation.