CVE-2026-53909 Arbitrary File Upload in MCO

MCO does not correctly validate types of uploaded files. File upload validation functionality relies only on client-side checks, which can be bypassed. An authorized, low-privileged attacker can upload files with arbitrary types to the server. Because vendor contact attempts were unsuccessful, th...

CVE-2026-53908

MCO is vulnerable to User Enumeration through authentication-related functionalities. The application returns distinguishable responses for valid and invalid users during username reminder and password reset operations. An attacker can leverage these differences to enumerate valid usernames and...

CVE-2026-53907 Stored Cross‑Site Scripting in MCO

MCO is vulnerable to Stored Cross‑Site Scripting XSS via the application logo upload functionality. An attacker with the ability to change the application logo can upload a crafted SVG file containing malicious JavaScript code that is executed when the logo is rendered or opened. Because vendor...

CVE-2026-53907

MCO is vulnerable to Stored Cross‑Site Scripting XSS via the application logo upload functionality. An attacker with the ability to change the application logo can upload a crafted SVG file containing malicious JavaScript code that is executed when the logo is rendered or opened. Because vendor...

CVE-2026-53907 Stored Cross‑Site Scripting in MCO

MCO is vulnerable to Stored Cross‑Site Scripting XSS via the application logo upload functionality. An attacker with the ability to change the application logo can upload a crafted SVG file containing malicious JavaScript code that is executed when the logo is rendered or opened. Because vendor...

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

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. Becau...

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

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. Becau...

CVE-2026-53905 Unauthorized Access to Administrator ACL View in MCO

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...

CVE-2026-53903 Insecure Direct Object Reference in MCO

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...

CVE-2026-53902 Privilege Escalation in MCO

MCO does not properly enforce authorization checks in the /customer/servlet/mco/webapi/profile-sections/group-membership endpoint. An authenticated user can modify their group membership without proper authorization checks, allowing privilege escalation. An attacker can add themselves to arbitrar...

PT-2026-54834

Name of the Vulnerable Software and Affected Versions MCO version 25.3.3.1 Description The application is susceptible to user enumeration via authentication-related features. During password reset and username reminder operations, the system provides different responses depending on whether the...

CVE-2026-53907: Improper Neutralization of Input During Web Page Generation

MCO is vulnerable to Stored Cross‑Site Scripting XSS via the application logo upload functionality. An attacker with the ability to change the application logo can upload a crafted SVG file containing malicious JavaScript code that is executed when the logo is rendered or opened. Because vendor...

CVE-2026-53906: Improper Limitation of a Pathname to a Restricted Directory

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. Becau...

CVE-2026-53902: Incorrect Privilege Assignment

MCO does not properly enforce authorization checks in the /customer/servlet/mco/webapi/profile-sections/group-membership endpoint. An authenticated user can modify their group membership without proper authorization checks, allowing privilege escalation. An attacker can add themselves to arbitrar...

CVE-2026-53908: Observable Response Discrepancy

MCO is vulnerable to User Enumeration through authentication-related functionalities. The application returns distinguishable responses for valid and invalid users during username reminder and password reset operations. An attacker can leverage these differences to enumerate valid usernames and...

CVE-2026-53909: Unrestricted Upload of File with Dangerous Type

MCO does not correctly validate types of uploaded files. File upload validation functionality relies only on client-side checks, which can be bypassed. An authorized, low-privileged attacker can upload files with arbitrary types to the server. Because vendor contact attempts were unsuccessful, th...

CVE-2026-53903: Authorization Bypass Through User-Controlled Key

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...

CVE-2026-53905: Incorrect Authorization

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...

CVE-2026-53904: Improper Restriction of Excessive Authentication Attempts

MCO is vulnerable to Account Denial of Service due to improper implementation of password reset functionality. Each password reset request invalidates previously set password as well as previously issued temporary passwords, furthermore, password resets are not limited in any way. An attacker who...

Malware in @fs-mco/error-translator

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outsid...