Stored XSS in Emlog CMS Article Publishing Module

Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in Emlog CMS versions up to 2.6.14. It allows a remote authenticated attacker to inject malicious JavaScript code into article content. When an administrator views or previews the article in the backend, the script executes in their browser session.

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Detection Guidance

To detect this vulnerability, inspect the article content in Emlog CMS versions <= 2.6.14 for suspicious JavaScript code or unusual characters in the admin panel. Check the database for articles containing script tags or event handlers like onload or onclick. Review server logs for unauthorized admin actions following article submissions.

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Impact Analysis

An attacker could use this to perform administrative actions without authorization, such as creating a backdoor administrator account. This could lead to full control over the website and its data.

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Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and access control. Organizations may face legal penalties and reputational damage.

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Mitigation Strategies

Immediately update Emlog CMS to the latest version beyond 2.6.14. If an update is not available, disable the article publishing module temporarily. Implement input validation to strip or encode JavaScript code in article submissions. Review admin accounts for unauthorized changes and revoke suspicious permissions.

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