CSRF to RCE in GetSimple CMS Community Edition

Executive Summary

This vulnerability is a Cross-Site Request Forgery (CSRF) flaw in GetSimple CMS CE versions before 1.5. The UpdateCE update form lacked an anti-CSRF token, and the server did not verify request origin or tokens. An attacker could host a malicious page that auto-submits a forged POST request to the update endpoint. When an authenticated administrator visits the page, the server performs an attacker-directed download-and-deploy operation, leading to remote code execution.

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Detection Guidance

Check if your GetSimple CMS CE version is below 1.5. Inspect network traffic for unauthorized POST requests to the UpdateCE endpoint. Look for unexpected file downloads or deployments in the CMS directory. Review server logs for suspicious administrator activity during updates.

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Impact Analysis

If you are an administrator of GetSimple CMS CE using a vulnerable version, an attacker could trick you into visiting a malicious page. This could allow the attacker to execute arbitrary code on your server, potentially taking full control of your system, stealing data, or disrupting services.

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Compliance Impact

This vulnerability could lead to unauthorized access, data breaches, or loss of data integrity, which are critical violations under GDPR and HIPAA. Organizations may face legal penalties, reputational damage, and loss of trust if exploited.

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Mitigation Strategies

Upgrade GetSimple CMS CE to version 1.5 or later immediately. Disable the UpdateCE plugin if not in use. Implement network-level protections to block unauthorized POST requests to the update endpoint. Monitor for signs of compromise such as unexpected files or code execution.

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