CVE WatchAug 21, 2026

CVE-2026-72529

TrueConf Server Missing Authentication for Critical Function Vulnerability

CVSS

9.8

Critical

EPSS

1.6%

p73

KEV

YES

Aug 20, 2026

Exploit Today

0-100

Published: Aug 19, 2026 · Last modified: Aug 21, 2026 · CWE-306

EPSS · 30d

0.3%EPSS · 30 days1.6%

2026-08-202026-08-30

KEV catalog record

Product

TrueConf / Server

Vulnerability

TrueConf Server Missing Authentication for Critical Function Vulnerability

Added to KEV

Aug 20, 2026

Remediate by

Aug 23, 2026

Known ransomware use

Summary description

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.

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.

Notes

https://trueconf.com/blog/news/security-fixes-updates-and-advisories ; https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-72529

Technical 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.

Official references

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