XSS in Kentico Xperience
CVE-2020-36891
A stored cross-site scripting vulnerability in Kentico Xperience allows attackers to upload files with spoofed Content-Type that do not match file extensions. Attackers can exploit this vulnerability by uploading malicious files with manipulated MIME types, allowing malicious scripts to execute in users' browsers.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (8.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Kentico Xperience — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (Product, vendor-advisory, patch)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2020-36891?
- CVE-2020-36891 is a medium-severity vulnerability in Kentico Xperience, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-12-18.
- How severe is CVE-2020-36891?
- Medium severity. CVSS v3 base score is 5.4 out of 10.