CVE-2026-53907
MediumCVSS 4.8Exploitation Probability (EPSS)
Low risk17th percentile — higher than 17% of all known CVEs
Summary
Stored Cross‑Site Scripting (XSS) vulnerability in MCO allows an attacker with privileges to change the application logo to inject malicious JavaScript code by uploading a crafted SVG file. The code executes when the logo is rendered or opened.
Risk Assessment
An attacker can steal user sessions, redirect users to malicious sites, or perform other actions in the victim's browser context, compromising the confidentiality and integrity of organizational data.
Recommendation
Immediately block the ability to upload SVG files as the application logo and implement validation and sanitization of uploaded image files. It is also recommended to update to the latest available version of MCO once released.
Original NVD description (English source)
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 contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.