CVE WatchAug 21, 2026

CVE-2026-72530

TrueConf Server Code Injection Vulnerability

CVSS

9.0

Critical

EPSS

1.8%

p77

KEV

YES

Aug 20, 2026

Exploit Today

0-100

Published: Aug 19, 2026 · Last modified: Aug 21, 2026 · CWE-94

EPSS · 30d

0.3%EPSS · 30 days1.8%

2026-08-202026-08-30

KEV catalog record

Product

TrueConf / Server

Vulnerability

TrueConf Server Code Injection Vulnerability

Added to KEV

Aug 20, 2026

Remediate by

Sep 3, 2026

Known ransomware use

Summary description

TrueConf Server contains a code injection vulnerability that could allow an unauthorized remote attacker with network access via port 4307/TCP to use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system.

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-breakout-from-isolated-environment/ ; 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-2026-72530

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 use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system.

Official references

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