TrueConf Server 5.3-5.5 RCE via Port 4307 (Isolated Env Bypass)
CVE-2026-72530 Published on August 19, 2026
A remote unauthorized attacker with network access via port 4307/TCP to the TrueConf server versions 5.3.X to 5.3.9, 5.4.X to 5.4.9, 5.5.X to 5.5.5, and earlier could use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system.
Known Exploited Vulnerability
This TrueConf Server Code Injection Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. TrueConf Server contains a code injection vulnerability that could allow an unauthorized remote attacker with network access via port 4307/TCP to use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system.
The following remediation steps are recommended / required by September 3, 2026: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicab
Vulnerability Analysis
CVE-2026-72530 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. This vulnerability is known to be actively exploited by threat actors. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Timeline
Issue discovered by Kaspersky ICS CERT and reported to TrueConf
Issue confirmed by TrueConf 1 day later.
Advisory published by Kaspersky ICS CERT 3 days later.
Weakness Type
What is a Code Injection Vulnerability?
The software constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
CVE-2026-72530 has been classified to as a Code Injection vulnerability or weakness.
Products Associated with CVE-2026-72530
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Affected Versions
TrueConf Server:- Version * and below 5.3 is affected.
- Version 5.3 and below 5.3.9 is affected.
- Version 5.4 and below 5.4.9 is affected.
- Version 5.5 and below 5.5.5 is affected.