Actively exploited in the wild
TrueConf Server Code Injection Vulnerability
TrueConf - Server · Listed in the CISA KEV since 2026-08-20. This indicates confirmed attacks in production environments.
Required action: 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.
CVE-2026-72530
CriticalCVSS 9.0KEVExploitation Probability (EPSS)
Elevated risk59th percentile - higher than 59% of all known CVEs
Summary
A remote unauthorized attacker with network access via port 4307/TCP to 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.
Risk Assessment
The risk includes full host system compromise, potentially leading to loss of confidentiality, integrity, and availability.
Recommendation
Immediately update TrueConf server to a non-vulnerable version and restrict access to port 4307/TCP.
Other vulnerabilities in TrueConf Server
See all- CVE-2026-72529CriticalActively exploited
A remote unauthorized attacker with network access via port 4307/TCP to 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.
- CVE-2025-66823Medium
An HTML Injection vulnerability in TrueConf server 5.5.2.10813 in the conference description field allows an attacker to inject arbitrary HTML in the Create/Edit conference functionality. The payload will be triggered when the victim opens the Conference Info page ([conference url]/info).
- CVE-2025-66834High
A CSV Formula Injection vulnerability in TrueConf Server v5.5.2.10813 allows a normal user to inject malicious spreadsheet formulas into exported chat logs via crafted Display Name.
- CVE-2025-66824High
A Stored Cross-Site Scripting (XSS) vulnerability exists in the Meeting location field of the Create/Edit Conference functionality in TrueConf Server v5.5.2.10813. The injected payload is stored via the meeting_room parameter and executed when users visit the Conference Info page, allowing full Account Takeover (ATO).
- CVE-2017-20120Medium
A vulnerability classified as problematic was found in TrueConf Server 4.3.7. It affects unknown code of the file /admin/service/stop/. The manipulation leads to cross-site request forgery. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS