CVEs / CVE-2026-72530
CVE-2026-72530: TrueConf Server Code Injection Vulnerability
- Known exploited in the CISA KEV catalog since 20 Aug 2026
- critical 9.5 CVSS 4.0 (from the CNA)
- EPSS 1.68% chance of exploitation in the next 30 days, higher than 76% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| TrueConf TrueConf Server | before 5.3 | 5.3 |
| TrueConf TrueConf Server | from 5.3, before 5.3.9 | 5.3.9 |
| TrueConf TrueConf Server | from 5.4, before 5.4.9 | 5.4.9 |
| TrueConf TrueConf Server | from 5.5, before 5.5.5 | 5.5.5 |
Exploitation
| In CISA KEV since | 20 Aug 2026 |
|---|---|
| Due date for US federal agencies | 3 Sep 2026 |
| Used in ransomware campaigns | 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. |
Severity
| CVSS 4.0 | 9.5 criticalCVSS: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:XScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-94 |
References
- CVE-2026-72530 on NVD
- CVE-2026-72530 in the CISA KEV catalog
- https://trueconf.com/blog/news/security-fixes-updates-and-advisories (cited by CISA)
- https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isolated-environment/ (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (cited by CISA)
- https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isolated-environment/ Third Party Advisory
- https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/ Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72530 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.