CVE-2026-72530

State: Published
Severity: 9.5 Critical
Published: Aug 19, 2026
Updated: Aug 21, 2026
Reserved: Aug 10, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	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	Kaspersky
3.1	9.0 Critical	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H	Kaspersky

Weaknesses

CWE-94 Code Injection

Affected Products

Product	Versions
TrueConf ServerTrueConf	before 5.3Affected 5.3 to before 5.3.9Affected 5.4 to before 5.4.9Affected 5.5 to before 5.5.5Affected

References

KLCERT-26-058: TrueConf Server. Break out of the isolated environmentthird-party-advisory
https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/related
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72530government-resource

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