CVE-2026-53906
MediumCVSS 5.1Exploitation Probability (EPSS)
Low risk34th percentile — higher than 34% of all known CVEs
Summary
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.
Risk Assessment
An attacker can gain access to sensitive information about the server's file system structure and write malicious files to arbitrary locations, potentially leading to privilege escalation or arbitrary code execution.
Recommendation
It is recommended to immediately update to the latest available version of MCO, if available, or apply temporary mitigations such as strict server-side validation of the filename parameter.
Original NVD description (English source)
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.