CVE-2026-53906

Path Disclosure and Path Traversal in MCO

State: Published
Severity: 5.1 Medium
Published: Jul 1, 2026
Updated: Jul 1, 2026
Reserved: Jun 11, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N	CERT-PL

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-209 Generation of Error Message Containing Sensitive Information

Affected Products

Product	Versions
MCOMyComplianceOffice	25.3.3.1Affected

References

https://cert.pl/en/posts/2026/07/CVE-2026-53902third-party-advisory
https://mco.mycomplianceoffice.com/product

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