Vulnerability · Published Dec 18, 2025 · Assigned by VulnCheck
CVE-2020-36891Kentico Xperience <= 12.0.49 File Upload Stored XSS
Medium 5.4
In plain English
A medium-severity cross-site scripting in Xperience from Kentico. 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 12% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 87.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- Kentico DevNet Hotfixes vendor-advisory, patch
- VulnCheck Advisory: Kentico Xperience <= 12.0.49 File Upload Stored XSS third-party-advisory