CVE-2026-72530

critical

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.

References

https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isolated-environment/

https://www.securityweek.com/cisa-urges-immediate-patching-of-exploited-trueconf-vulnerabilities/

https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-actively-exploited-trueconf-server-flaws/

https://securityaffairs.com/197602/security/u-s-cisa-adds-trueconf-server-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/08/20/cisa-adds-two-known-exploited-vulnerabilities-catalog

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72530

Details

Source: Mitre, NVD

Published: 2026-08-19

Updated: 2026-08-21

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 7.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 9

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 9.5

Vector: 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

Severity: Critical

EPSS

EPSS: 0.0034