Vulnerability · Published Jul 1, 2026 · Assigned by CERT-PL

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

Medium 5.1

In plain English

A medium-severity path traversal in MCO from MyComplianceOffice. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.5%top 55.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
MyComplianceOffice	MCO	25.3.3.1

Weakness: CWE-22, CWE-209 · Vector: 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

References

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