Executive Summary

CVE-2020-36889 is a stored cross-site scripting (XSS) vulnerability in Kentico Xperience versions up to 12.0.90. It occurs because error messages improperly neutralize input, allowing attackers to inject malicious scripts via specially crafted object names. When administrators view these error messages in the administration interface, the malicious scripts execute in their browsers. [1]

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Impact Analysis

This vulnerability can allow attackers to execute malicious scripts in the browsers of administrators who view the affected error messages. This could lead to unauthorized actions performed with administrator privileges, potential data theft, or compromise of the administration interface's integrity. [1]

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Detection Guidance

Detection involves monitoring the Kentico Xperience administration interface for error messages containing suspicious or specially crafted object names that could indicate attempted XSS injection. Since the vulnerability manifests when administrators view error messages, reviewing logs or error outputs for unusual script tags or encoded payloads is recommended. Specific commands are not provided in the available resources. [1]

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Mitigation Strategies

Immediate mitigation steps include applying the relevant hotfixes provided by the Kentico Security Team to address the vulnerability. Additionally, restrict administrative access to trusted users only and educate administrators to avoid interacting with suspicious error messages until the patch is applied. [1]

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