TI-2026-50789 Aliases CVE-2026-72529 GHSA-xc2x-q39j-746f

Missing authentication in TrueConf Server

CRITICAL 99Exploited in the wildCWE-306Published 2026-08-19 · Updated 2026-08-21

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2026-08-20CISA due date 2026-08-23

EPSS 0.01464 73rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed TrueConf Server (TrueConf): 5.3.9, 5.4.9, 5.5.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Active
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
TrueConf	TrueConf Server	before 5.3; 5.3 to before 5.3.9; 5.4 to before 5.4.9; 5.5 to before 5.5.5	5.3.9, 5.4.9, 5.5.5	Patch available	CNA

TrueConf Server VendorTrueConf Affected before 5.3; 5.3 to before 5.3.9; 5.4 to before 5.4.9; 5.5 to before 5.5.5 Fixed in 5.3.9, 5.4.9, 5.5.5 Patch available CNA

CPE configurations NVD · 6

CPE	Versions	Role	Vendor
cpe:2.3:a:trueconf:trueconf_server::::::windows::*	before 5.3.9.10013	Vulnerable	TrueConf
cpe:2.3:a:trueconf:trueconf_server::::::linux_kernel::*	before 5.3.9.10015	Vulnerable	TrueConf
cpe:2.3:a:trueconf:trueconf_server::::::windows::*	5.4.0.12689 to before 5.4.9.10072	Vulnerable	TrueConf
cpe:2.3:a:trueconf:trueconf_server::::::linux_kernel::*	5.4.0.12700 to before 5.4.9.10019	Vulnerable	TrueConf
cpe:2.3:a:trueconf:trueconf_server::::::windows::*	5.5.0.13826 to before 5.5.5.10010	Vulnerable	TrueConf
cpe:2.3:a:trueconf:trueconf_server::::::linux_kernel::*	5.5.0.13828 to before 5.5.5.10009	Vulnerable	TrueConf

cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:* Versions before 5.3.9.10013 Vulnerable ·TrueConf
cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:* Versions before 5.3.9.10015 Vulnerable ·TrueConf
cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:* Versions 5.4.0.12689 to before 5.4.9.10072 Vulnerable ·TrueConf
cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:* Versions 5.4.0.12700 to before 5.4.9.10019 Vulnerable ·TrueConf
cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:* Versions 5.5.0.13826 to before 5.5.5.10010 Vulnerable ·TrueConf
cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:* Versions 5.5.0.13828 to before 5.5.5.10009 Vulnerable ·TrueConf

Remediation

Fix · CNA TrueConf Server (TrueConf) Fixed in 5.3.9, 5.4.9, 5.5.5

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-08-19
TrueConf Server 5.3, 5.3.9 and 2 more versions
2 records Highest priority Priority CRITICAL 2 CRITICAL
Other records, highest priority first
- TI-2026-50790 Code injection in TrueConf ServerPriority CRITICAL 100
Show all 2 records →

Timeline

2026-08-20 Added to CISA KEV
2026-10-02 Threatist record created from CVE-2026-72529
2026-10-03 Alias added: GHSA-xc2x-q39j-746f

References

Exploit 1

https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/

Advisory 1

KLCERT-26-057: TrueConf Server. Missing Authentication for Critical Function

TI-2026-50790 Code injection in TrueConf Server KEVCVSS 4.0CRITICAL 9.5
TI-2025-41058 A Stored Cross-Site Scripting (XSS) vulnerability exists in the Meeting location field of… CVSS 3.1HIGH 8.7
TI-2025-41059 A CSV Formula Injection vulnerability in TrueConf Server v5.5.2.10813 allows a normal… CVSS 3.1HIGH 7.3
TI-2025-41057 An HTML Injection vulnerability in TrueConf server 5.5.2.10813 in the conference… CVSS 3.1MEDIUM 5.4
TI-2017-14186 TrueConf Server cross-site request forgery CVSS 3.1HIGH 8.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences