CVE-2026-53903 Details
Description
MCO is vulnerable to an Insecure Direct Object Reference (IDOR) vulnerability in the /customer/servlet/mco/webapi/trading-document/fetchPdfStatement endpoint. The application does not properly validate whether an authenticated user is authorized to access a requested document, allowing direct retrieval based on a user-supplied identifier. An attacker can access trading documents belonging to other users by providing a valid document ID. Although exploitation requires guessing the identifier, predictable ID patterns enable feasible enumeration, leading to unauthorized disclosure of sensitive information. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.
A vulnerability allowing Insecure Direct Object Reference (IDOR) has been identified in MyComplianceOffice (MCO) version 25.3.3.1. The issue resides in the '/customer/servlet/mco/webapi/trading-document/fetchPdfStatement' endpoint, where the application fails to properly validate if an authenticated user is authorized to access a requested document. This lack of validation enables users to directly retrieve documents by supplying a valid document ID. Although exploitation requires guessing the identifier, predictable ID patterns allow for feasible enumeration, resulting in unauthorized access to sensitive information.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 1, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://cert.pl/en/posts/2026/07/CVE-2026-53902 | [email protected] | Third Party Advisory |
| https://mco.mycomplianceoffice.com/ | [email protected] | Product |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| mycomplianceoffice mycomplianceoffice | 25.3.3.1 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 6, 2026 | Initial Analysis | [email protected] |
| Jul 1, 2026 | CVE Modified | CISA-ADP |
| Jul 1, 2026 | New CVE Received | [email protected] |