CVE-2026-53908: medium-severity vulnerability in MyComplianceOffice MCO
User Enumeration in MCO
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.9epss 0.4%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Affected products
MyComplianceOffice · MCORelated CVEs — MyComplianceOffice MCO
In the same product, most dangerous first.
CVE-2026-53906MEDIUMPath Disclosure and Path Traversal in MCOEPSS 0.5%CVE-2026-53903MEDIUMInsecure Direct Object Reference in MCOEPSS 0.4%CVE-2026-53909MEDIUMArbitrary File Upload in MCOEPSS 0.4%CVE-2026-53902HIGHPrivilege Escalation in MCOEPSS 0.3%CVE-2026-53904MEDIUMAccount Denial of Service in MCOEPSS 0.3%CVE-2026-53905MEDIUMUnauthorized Access to Administrator ACL View in MCOEPSS 0.3%