What’s Vulnerable › Vulnerabilities

CVE-2020-36891: Kentico Xperience <= 12.0.49 File Upload Stored XSS

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-18 · updated 2026-06-17
• Weakness: CWE-79

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

• Kentico Xperience: through 12.0.49

References

• https://devnet.kentico.com/download/hotfixes
• https://www.vulncheck.com/advisories/kentico-xperience-file-upload-stored-xss

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