CVEvulnerability

CVE-2026-72530

9.5 CRITICAL Known exploited Published 2026-08-19 Modified 2026-08-21 Official page ↗

CISA Known Exploited Vulnerability

TrueConf Server Code Injection Vulnerability — TrueConf Server

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.

Added to KEV: 2026-08-20
Remediation due: 2026-09-03
Ransomware use: Unknown
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

Status: Analyzed
Published: 2026-08-19
Last modified: 2026-08-21
Assigner: [email protected]
CVSS 4.0 ([email protected]): 9.5 CRITICAL — CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected]): 9.0 CRITICAL — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Weaknesses: CWE-94

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.

Affected configurations

• trueconf trueconf server (< 5.3.9.10013) • trueconf trueconf server (< 5.3.9.10015) • trueconf trueconf server (>= 5.4.0.12689 < 5.4.9.10072) • trueconf trueconf server (>= 5.4.0.12700 < 5.4.9.10019) • trueconf trueconf server (>= 5.5.0.13826 < 5.5.5.10010) • trueconf trueconf server (>= 5.5.0.13828 < 5.5.5.10009)

Weakness · CWE (1)

CWE-94 Improper Control of Generation of Code weakness

References