MyComplianceOffice MCO 25.3.3.1 Error Message filename path traversal

Summaryinfo

A vulnerability classified as critical has been found in MyComplianceOffice MCO 25.3.3.1. Affected by this vulnerability is an unknown functionality of the component Error Message Handler. Performing a manipulation of the argument filename results in path traversal. This vulnerability is reported as CVE-2026-53906. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical has been found in MyComplianceOffice MCO 25.3.3.1. This affects some unknown processing of the component Error Message Handler. The manipulation of the argument filename with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed with AFINE Team. It is possible to read the advisory at cert.pl. This vulnerability is uniquely identified as CVE-2026-53906 since 06/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are required for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/01/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• MyComplianceOffice

Name

• MCO

Version

• 25.3.3.1

CPE 2.3info

• 🔒

CPE 2.2info

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