CVEs / CVE-2026-72529
CVE-2026-72529: TrueConf Server Missing Authentication for Critical Function Vulnerability
- Known exploited in the CISA KEV catalog since 20 Aug 2026
- critical 9.3 CVSS 4.0 (from the CNA)
- EPSS 1.46% chance of exploitation in the next 30 days, higher than 73% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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.
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 | 23 Aug 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 | 9.3 criticalCVSS: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:XScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-306 |
References
- CVE-2026-72529 on NVD
- CVE-2026-72529 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-missing-authentication-for-critical-function/ (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-missing-authentication-for-critical-function/ 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-2026-72529 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.