What’s Vulnerable › Vulnerabilities

CVE-2026-72529: TrueConf Server Missing Authentication for Critical Function Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-08-20
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-19 · updated 2026-08-21
• Weakness: CWE-306

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.

Affected products

• Trueconf Server: before 5.3.9.10013; before 5.3.9.10015; from 5.4.0.12689 before 5.4.9.10072; from 5.4.0.12700 before 5.4.9.10019; from 5.5.0.13826 before 5.5.5.10010; from 5.5.0.13828 before 5.5.5.10009 — fixed in 5.3.9.10013, 5.3.9.10015, 5.4.9.10019, 5.4.9.10072, 5.5.5.10009, 5.5.5.10010

How to fix

Upgrade to a fixed version: Trueconf Server 5.3.9.10013, 5.3.9.10015, 5.4.9.10019, 5.4.9.10072. Check the vendor advisory for mitigations.

References

• https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function/
• https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72529

Get alerted when CVE-2026-72529 or the next vulnerability affects your stack