CVE-2026-53907CWE-79

Stored Cross‑Site Scripting in MCO

Medium · published July 1, 2026

CVSS v4.0
4.8
EPSS
0%
Percentile
14.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
4.8 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS
0.00241 · 14.4th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-07-01T11:58Z
EPSS history
Timeline
  • 01 JUL 11:58Z
    Stored Cross‑Site Scripting in MCO
    cvelistv5