CVE-2026-72529

Description

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.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 9.3CVSS 4.0, Criticalfrom the CNA (Kaspersky)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
• 9.8CVSS 3.1, Criticalfrom the CNA (Kaspersky)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What to do

• Update TrueConf server to versions 5.3.9, 5.4.9 or 5.5.5.CNA solution statement
• Perform a full check with anti-virus software that has up-to-date anti-virus databases and software modules.CNA workaround statement
• Conduct a scan for indicators of compromise. In the event of detecting indicators of compromise, change passwords for accounts that may have been compromised and contact Kaspersky ICS CERT at ics-cert@kaspersky.com for further instructions and assistance in investigating the incident.CNA workaround statement
• 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.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 3 Aug 2026 Issue discovered by Kaspersky ICS CERT and reported to TrueConf
2. 4 Aug 2026 Issue confirmed by TrueConf
3. 7 Aug 2026 Advisory published by Kaspersky ICS CERT
4. 19 Aug 2026 Published
5. 20 Aug 2026 CVE-2026-72529 added to CISA KEV
6. 20 Aug 2026 Added to the CISA KEV catalogue

Weakness

• CWE-306

References

• KLCERT-26-057: TrueConf Server. Missing Authentication for Critical Functionthird-party-advisory