Unauthorized Access to Administrator ACL View in MCO
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MyComplianceOffice | MCO | 25.3.3.1 | — | No fix listed | CNA |
- MCO VendorMyComplianceOffice Affected 25.3.3.1 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mycomplianceoffice:mycomplianceoffice:25.3.3.1:*:*:*:*:*:*:* | 25.3.3.1 | Vulnerable | MyComplianceOffice |
- cpe:2.3:a:mycomplianceoffice:mycomplianceoffice:25.3.3.1:*:*:*:*:*:*:* Versions 25.3.3.1 Vulnerable ·MyComplianceOffice
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-53905
- 2026-10-03 Alias added: GHSA-4hjp-j24w-p3rr
References
More Mycomplianceoffice vulnerabilities
- TI-2026-38884 User Enumeration in MCO CVSS 4.0MEDIUM 6.9
- TI-2026-38878 Privilege Escalation in MCO CVSS 4.0HIGH 7.1
- TI-2026-38885 Arbitrary File Upload in MCO CVSS 4.0MEDIUM 5.3
- TI-2026-38882 Path Disclosure and Path Traversal in MCO CVSS 4.0MEDIUM 5.1
- TI-2026-38879 Insecure Direct Object Reference in MCO CVSS 4.0MEDIUM 5.3
- TI-2026-38883 Stored Cross‑Site Scripting in MCO CVSS 4.0MEDIUM 4.8
Sources
- CVE-2026-53905 · CVE Program
- CVE-2026-53905 · NVD
- FIRST EPSS
- GHSA-4hjp-j24w-p3rr · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences