CVE-2026-53905

UNKNOWN 0.0

Unauthorized Access to Administrator ACL View in MCO

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-863
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)