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CVE-2026-53903— Insecure Direct Object Reference in MCO

Quick assessment

Affected
MyComplianceOffice MCO
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MyComplianceOffice MCO是MyComplianceOffice公司的一款合规与风险管理软件。 MyComplianceOffice MCO 25.3.3.1版本存在授权问题漏洞，该漏洞源于对/customer/servlet/mco/webapi/trading-document/fetchPdfStatement端点的用户输入文档标识符验证不当，导致不安全的直接对象引用（IDOR），可能造成经过身份验证的攻击者访问其他用户的交易文档，导致敏感信息泄露。

AI Predicted 6.5 Difficulty: Easy EPSS 0.24% · P16

Affected Version Matrix 1

VendorProduct Version RangeStatus
MyComplianceOffice MCO 25.3.3.1 affected
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I. Basic Information for CVE-2026-53903

Vulnerability Information
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Vulnerability Title
Insecure Direct Object Reference in MCO
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
MyComplianceOffice MCO 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MyComplianceOffice MCO是MyComplianceOffice公司的一款合规与风险管理软件。 MyComplianceOffice MCO 25.3.3.1版本存在授权问题漏洞，该漏洞源于对/customer/servlet/mco/webapi/trading-document/fetchPdfStatement端点的用户输入文档标识符验证不当，导致不安全的直接对象引用（IDOR），可能造成经过身份验证的攻击者访问其他用户的交易文档，导致敏感信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MyComplianceOffice MCO 25.3.3.1 -

II. Public POCs for CVE-2026-53903

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III. Intelligence Information for CVE-2026-53903

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Security Blog Posts for CVE-2026-53903 (1)

Vendor Pages for CVE-2026-53903 (1)

Same Patch Batch · MyComplianceOffice · 2026-07-01 · 8 CVEs total

CVE-2026-53902 Privilege Escalation in MCO
CVE-2026-53908 User Enumeration in MCO
CVE-2026-53907 Stored Cross‑Site Scripting in MCO
CVE-2026-53906 Path Disclosure and Path Traversal in MCO
CVE-2026-53904 Account Denial of Service in MCO
CVE-2026-53905 Unauthorized Access to Administrator ACL View in MCO
CVE-2026-53909 Arbitrary File Upload in MCO

IV. Related Vulnerabilities

Same product: MCO
Same vendor: MyComplianceOffice
Same weakness: CWE-639

V. Comments for CVE-2026-53903

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