TrueConf Server up to 5.2/5.3.8/5.4.8/5.5.4 improper authorization

Summaryinfo

A vulnerability identified as critical has been detected in TrueConf Server up to 5.2/5.3.8/5.4.8/5.5.4. This affects an unknown part. This manipulation causes improper authorization. This vulnerability is handled as CVE-2026-72530. The attack can be initiated remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability has been found in TrueConf Server up to 5.2/5.3.8/5.4.8/5.5.4 and classified as critical. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at ics-cert.kaspersky.com. This vulnerability is known as CVE-2026-72530 since 08/10/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but an exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 08/20/2026 with a due date of 09/03/2026:

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 applicable BO

Upgrading to version 5.3, 5.3.9, 5.4.9 or 5.5.5 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• TrueConf

Name

• Server

Version

• 5.0
• 5.1
• 5.2
• 5.3.0
• 5.3.1
• 5.3.2
• 5.3.3
• 5.3.4
• 5.3.5
• 5.3.6
• 5.3.7
• 5.3.8
• 5.4.0
• 5.4.1
• 5.4.2
• 5.4.3
• 5.4.4
• 5.4.5
• 5.4.6
• 5.4.7
• 5.4.8
• 5.5.0
• 5.5.1
• 5.5.2
• 5.5.3
• 5.5.4

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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