CVE-2026-72530: TrueConf Server Code Injection Vulnerability

What it is

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.

What to do

Treat this as urgent. Identify every affected system, starting with anything internet-facing, and apply the vendor fix or mitigation within days. If you cannot patch quickly, isolate or disable the affected service and watch for signs of compromise.

Priority

Act now: Patch or mitigate internet-facing systems within days.

Severity (CVSS)

9.5 critical

CISA assessment (SSVC)

actively exploited; needs manual effort per target; total control of the affected system

Exploit probability (EPSS, 30 days)

1.7%, higher than 76% of all CVEs

Added to CISA KEV

20 August 2026

CISA fix-by date

3 September 2026 (US federal agencies; a sensible deadline for everyone)

Ransomware use

Not known

Weakness

CWE-94

References

• NIST NVD entry
• CISA KEV entry
• ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isola
• securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/
• www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72530

Sources: CISA Known Exploited Vulnerabilities · FIRST Exploit Prediction Scoring System (EPSS) · NIST National Vulnerability Database · CISA Vulnrichment (SSVC), via the CVE Program. This product uses data from the NVD API but is not endorsed or certified by the NVD. Summaries are machine-written from CISA’s description; treat the vendor’s advisory as the authority for fixes.