CVE-2026-53905: medium-severity vulnerability in MyComplianceOffice MCO
Unauthorized Access to Administrator ACL View 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 5.3epss 0.3%
MCO does not properly enforce authorization checks in the /customer/servlet/mco/webapi/admin-view-hierarchy/get-acl-tree-structure endpoint. An authenticated, low-privileged user can retrieve administrator access control structures without proper authorization checks.
This may expose sensitive permission mappings and internal configuration details.
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:L/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-2026-53908MEDIUMUser Enumeration in MCOEPSS 0.4%CVE-2026-53902HIGHPrivilege Escalation in MCOEPSS 0.3%CVE-2026-53904MEDIUMAccount Denial of Service in MCOEPSS 0.3%