Arbitrary Script Exec via Undocumented Func on TrueConf Serv <5.5.5
CVE-2026-72529 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 execute an arbitrary script by calling an undocumented function.
Known Exploited Vulnerability
This TrueConf Server Missing Authentication for Critical Function Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. TrueConf Server contains a missing authentication for critical function vulnerability which could allow a remote unauthorized attacker with network access via port 4307/TCP to execute an arbitrary script.
The following remediation steps are recommended / required by August 23, 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-2026-72529 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. 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
Missing Authentication for Critical Function
The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Products Associated with CVE-2026-72529
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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.