CVE-2020-36891
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-18

Last updated on: 2025-12-27

Assigner: VulnCheck

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.
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Meta Information
Published
2025-12-18
Last Modified
2025-12-27
Generated
2026-06-16
AI Q&A
2025-12-18
EPSS Evaluated
2026-06-15
NVD
CVE-2020-36891
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
kentico xperience to 12.0.49 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

CVE-2020-36891 is a stored cross-site scripting (XSS) vulnerability in Kentico Xperience up to version 12.0.49. It occurs because the system improperly neutralizes input during web page generation. Attackers can upload files with spoofed Content-Type headers that do not match the actual file extensions. This allows malicious scripts embedded in these files to execute in users' browsers, leading to stored XSS attacks. [1]

Impact Analysis

This vulnerability can allow attackers to execute malicious scripts in the browsers of users who view the affected content. This can lead to unauthorized actions such as stealing user credentials, session hijacking, or performing actions on behalf of the user. The impact is rated as medium severity with low confidentiality and integrity impacts, but it requires user interaction and some privileges to exploit. [1]

Mitigation Strategies

Apply the hotfix available from Kentico DevNet that addresses this vulnerability in Kentico Xperience versions up to and including 12.0.49. This update fixes the issue with improper neutralization of input and prevents attackers from exploiting the stored XSS via spoofed Content-Type file uploads. [1]

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