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    CVE-2026-53905

    MCO does not properly enforce authorization checks in the /customer/servlet/mco/webapi/admin-view-hierarchy/get-acl-tree-structure endpoint. An authenticated, low-privileged user can retrieve administrator access control structures without proper authorization checks. This may expose sensitive permission mappings and internal configuration details. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.

    Published:Jul 1, 2026
    Last Modified:Jul 6, 2026
    EPS:Jul 1, 2026
    EPSS Score:0.00234
    CVSS Score:5.3

    Affected Products

    Vendor
    Mycomplianceoffice
    Product
    Mco

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-863 Incorrect Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-53909 (CVSS 5.3) — MCO does not correctly validate types of uploaded files. File upload validation functionality relies only on c…
    CVE-2026-53908 (CVSS 6.9) — MCO is vulnerable to User Enumeration through authentication-related functionalities. The application returns …
    CVE-2026-53907 (CVSS 4.8) — MCO is vulnerable to Stored Cross‑Site Scripting (XSS) via the application logo upload functionality. An attac…
    CVE-2026-53906 (CVSS 5.1) — MCO is vulnerable to Path Disclosure and Path Traversal in file handling functionality related to data export …
    CVE-2026-53904 (CVSS 6.3) — MCO is vulnerable to Account Denial of Service due to improper implementation of password reset functionality.…
    CVE-2026-53903 (CVSS 5.3) — MCO is vulnerable to an Insecure Direct Object Reference (IDOR) vulnerability in the /customer/servlet/mco/web…
    CVE-2026-53902 (CVSS 7.1) — MCO does not properly enforce authorization checks in the /customer/servlet/mco/webapi/profile-sections/group-…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High