CVE-2026-53902 Privilege Escalation in MCO
Authenticated users can escalate privileges by modifying group membership via an insecure API endpoint in MCO compliance software.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-53902?
CVE-2026-53902 is a high-severity vulnerability in MyComplianceOffice MCO, published on 1 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MCO does not properly enforce authorization checks in the /customer/servlet/mco/webapi/profile-sections/group-membership endpoint. An authenticated user can modify their group membership without proper authorization checks, allowing privilege escalation. An attacker can add themselves to arbitrary groups by supplying a valid group ID, which can be obtained via other application functionalities (e.g. /customer/servlet/mco/webapi/group/picker/groups), provided he has necessary permissions, or potentially inferred through brute-force techniques.
Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.
Which versions are affected by CVE-2026-53902?
It affects 1 product.
Products include Mycomplianceoffice Mycomplianceoffice.
How do I fix CVE-2026-53902?
No fix has been published for CVE-2026-53902 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-53902 being exploited?
There is no known exploitation of CVE-2026-53902 in the wild and no public exploit code.
Other vulnerabilities in MyComplianceOffice MCO
Sources
Also known as GHSA-rgv6-j8h9-46fv.