CVE-2026-72530
KEV: known exploited SSVC: activeCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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/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:X
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
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.1 vectorThis vulnerability may be exploitable over the internet without authentication or user interaction.
| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | H | High (conditions required) |
| Privileges required PR | N | None |
| User interaction UI | N | None |
| Scope S | C | Changed (affects other components) |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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.
Solutions (CNA)
Update TrueConf server to versions 5.3.9, 5.4.9 or 5.5.5.
Workarounds (CNA)
Perform a full check with anti-virus software that has up-to-date anti-virus databases and software modules.
Conduct a scan for indicators of compromise. In the event of detecting indicators of compromise, change passwords for accounts that may have been compromised and contact Kaspersky ICS CERT at [email protected] for further instructions and assistance in investigating the incident.
CISA KEV entry
TrueConf Server Code Injection Vulnerability — TrueConf / Server
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.
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.
https://trueconf.com/blog/news/security-fixes-updates-and-advisories ; https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isolated-environment/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-72530
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 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/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:X |
| NVD / [email protected] (Secondary) | 3.1 | 9.0 CRITICAL | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
| CNA / Kaspersky | 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 |
| CNA / 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 |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| TrueConf | TrueConf Server | affected: * … < 5.3 affected: 5.3 … < 5.3.9 affected: 5.4 … < 5.4.9 affected: 5.5 … < 5.5.5 default: unaffected |
NVD CPE (6)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| trueconf | trueconf_server | < 5.3.9.10013 | cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:* |
| trueconf | trueconf_server | < 5.3.9.10015 | cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:* |
| trueconf | trueconf_server | >= 5.4.0.12689, < 5.4.9.10072 | cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:* |
| trueconf | trueconf_server | >= 5.4.0.12700, < 5.4.9.10019 | cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:* |
| trueconf | trueconf_server | >= 5.5.0.13826, < 5.5.5.10010 | cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:* |
| trueconf | trueconf_server | >= 5.5.0.13828, < 5.5.5.10009 | cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:* |
Linux distribution status
References (3)
- https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isolated-environment/ NVD, CNA Third Party Advisorythird-party-advisory
- https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/ NVD, ADP CISA-ADP ExploitThird Party Advisoryrelated
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72530 NVD, ADP CISA-ADP US Government Resourcegovernment-resource