# CVE-2026-53906: MyComplianceOffice MCO path traversal and path disclosure in file handling

Source: https://junglewise.ai/threats/cve-2026-53906-mycomplianceoffice-mco-path-traversal-and-path-disclosure-in-file  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-01. Updated: 2026-07-01  
License: CC BY 4.0 with a link back

CVE-2026-53906 · Severity: info · CVSS 5.1 · Published 2026-07-01

MyComplianceOffice (MCO) is a compliance management platform used by financial services and insurance firms to automate regulatory oversight and risk management. A security vulnerability in the software's file handling system allows high-privileged users to manipulate file paths during data exports and uploads. This could lead to the unauthorized writing of files to sensitive server locations or the exposure of internal server directory structures through error messages, potentially compromising the integrity of the hosting environment.

Technologies: [MyComplianceOffice MCO](https://junglewise.ai/threats/technologies/mco). Vendors: [MyComplianceOffice](https://junglewise.ai/threats/vendors/mycomplianceoffice).

## Quick answers

**Is CVE-2026-53906 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-53906 being exploited in the wild.

**How severe is CVE-2026-53906?** Informational severity, with a CVSS score of 5.1, published 1 July 2026.

**Which products and versions are affected?** MyComplianceOffice MCO 25.3.3.1.

**Is there a fix for CVE-2026-53906?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-53906 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-53906?** Check whether you run MyComplianceOffice MCO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A path traversal and path disclosure vulnerability exists in MyComplianceOffice (MCO) version 25.3.3.1. The flaw is located in the file handling functionality related to data export and upload, where the application fails to properly validate the 'filename' parameter. An authenticated attacker with high privileges can exploit this to perform directory traversal, enabling the writing of files to arbitrary locations on the server filesystem. Additionally, improper error handling during these operations can leak absolute server paths to the attacker. While the vendor has not confirmed the fix, the vulnerability was disclosed by CERT Polska after unsuccessful contact attempts.

## Affected products

- MyComplianceOffice MCO 25.3.3.1

## Timeline

- 2026-07-01: advisory: Advisory published by CERT Polska
- 2026-07-01: disclosed: NVD publication date

## References

- [https://cert.pl/en/posts/2026/07/CVE-2026-53902](https://cert.pl/en/posts/2026/07/CVE-2026-53902)
- [https://mco.mycomplianceoffice.com/](https://mco.mycomplianceoffice.com/)

## Related threats

- [MyComplianceOffice MCO Unrestricted File Upload](https://junglewise.ai/threats/cve-2026-53909-mycomplianceoffice-mco-unrestricted-file-upload)
- [MyComplianceOffice MCO user enumeration in authentication components](https://junglewise.ai/threats/cve-2026-53908-mycomplianceoffice-mco-user-enumeration-in-authentication)
- [MyComplianceOffice MCO Stored XSS in logo upload](https://junglewise.ai/threats/cve-2026-53907-mycomplianceoffice-mco-stored-xss-in-logo-upload)
- [MyComplianceOffice MCO Incorrect Authorization in ACL Tree Endpoint](https://junglewise.ai/threats/cve-2026-53905-mycomplianceoffice-mco-incorrect-authorization-in-acl-tree)
- [MyComplianceOffice MCO Account Denial of Service in password reset](https://junglewise.ai/threats/cve-2026-53904-mycomplianceoffice-mco-account-denial-of-service-in-password)