CVE-2026-72530: critical vulnerability in TrueConf Server
Published · Updated
Prioritize patching. It under exploitation confirmed by CISA and has a public proof of concept.
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 applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
A vulnerability in TrueConf server allows remote attackers to execute arbitrary code on the affected system by sending a specially crafted script through port 4307/TCP, breaking out of the security sandbox that normally restricts what code can do.
CWE-94 (Code Injection) vulnerability affecting TrueConf versions 5.3.0-5.3.9, 5.4.0-5.4.9, 5.5.0-5.5.5 and earlier. An unauthenticated attacker with network access to port 4307/TCP can exploit improper input validation to inject and execute arbitrary code outside the intended isolated environment, achieving remote code execution on the host system.
In the same product, most dangerous first.