CVE-2026-72529
KEV: known exploited SSVC: activeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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 | L | Low (easy) |
| Privileges required PR | N | None |
| User interaction UI | N | None |
| Scope S | U | Unchanged |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 execute an arbitrary script by calling an undocumented function.
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 Missing Authentication for Critical Function Vulnerability — TrueConf / Server
TrueConf Server contains a missing authentication for critical function vulnerability which could allow a remote unauthorized attacker with network access via port 4307/TCP to execute an arbitrary script.
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-missing-authentication-for-critical-function/ ; 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-2026-72529
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 4.0 | 9.3 CRITICAL | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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 | 9.8 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA / Kaspersky | 4.0 | 9.3 CRITICAL | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA / Kaspersky | 3.1 | 9.8 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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-missing-authentication-for-critical-function/ 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-2026-72529 NVD, ADP CISA-ADP US Government Resourcegovernment-resource