Vulnerability · Published Jul 1, 2026 · Assigned by CERT-PL
CVE-2026-53907Stored Cross‑Site Scripting in MCO
Medium 4.8
In plain English
A medium-severity cross-site scripting in MCO from MyComplianceOffice. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MyComplianceOffice | MCO | 25.3.3.1 |
Weakness: CWE-79 · 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
References
- https://cert.pl/en/posts/2026/07/CVE-2026-53902 third-party-advisory
- https://mco.mycomplianceoffice.com/ product