CVE-2026-53906 Path Disclosure and Path Traversal in MCO

Medium 5.1 Published 1 Jul 2026 Updated 1 Jul 2026

Attackers can write files to arbitrary locations and disclose server paths via improper filename validation in MCO's export and upload features.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-53906?

CVE-2026-53906 is a medium-severity path traversal vulnerability in MyComplianceOffice MCO, published on 1 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

MCO is vulnerable to Path Disclosure and Path Traversal in file handling functionality related to data export and upload. Improper validation of the filename parameter allows writing files to arbitrary locations as well as indirect disclosure of absolute server paths through error messages.

Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.

Weakness: CWE-22, CWE-209

Which versions are affected by CVE-2026-53906?

It affects 1 product.

Products include Mycomplianceoffice Mycomplianceoffice.

How do I fix CVE-2026-53906?

No fix has been published for CVE-2026-53906 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-53906 being exploited?

There is no known exploitation of CVE-2026-53906 in the wild and no public exploit code.

Sources

Also known as GHSA-qwcf-5293-mm28.