Remote Code Execution in TrueConf Server

Executive Summary

CVE-2026-72529 is a vulnerability in TrueConf Server versions 5.3.X to 5.3.9, 5.4.X to 5.4.9, and 5.5.X to 5.5.5. It allows a remote unauthorized attacker with network access via port 4307/TCP to execute arbitrary scripts by calling an undocumented function without authentication.

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Detection Guidance

Check for unauthorized network connections on port 4307/TCP using commands like 'netstat -tulnp | grep 4307' or 'ss -tulnp | grep 4307'. Inspect server logs for unusual script execution or undocumented function calls. Look for indicators of compromise related to PhantomCore malware.

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Impact Analysis

An attacker could exploit this to run arbitrary scripts on the TrueConf server, potentially leading to unauthorized access, data theft, or malware deployment like PhantomCore. This could disrupt server operations and compromise sensitive information.

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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 confidentiality. Organizations may face legal penalties and reputational damage.

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Mitigation Strategies

Update TrueConf Server to versions 5.3.9, 5.4.9, or 5.5.5 immediately. Perform antivirus scans to detect PhantomCore malware. Block port 4307/TCP at the firewall if not required. Monitor for suspicious activity and check for indicators of compromise.

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