CVE-2026-72529
TrueConf Server Missing Authentication for Critical Function Vulnerability - [Actively Exploited]
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.
INFO
Published Date :
Aug. 19, 2026, 5:21 p.m.
Last Modified :
Aug. 21, 2026, 4:18 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
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.
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.
Unknown
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
Affected Products
The following products are affected by CVE-2026-72529
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | e45d732a-8f6b-4b6b-be76-7420f6a2b988 | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE | ||||
| CVSS 4.0 | CRITICAL | e45d732a-8f6b-4b6b-be76-7420f6a2b988 | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update TrueConf Server to a patched version.
- Restrict network access to port 4307/TCP.
- Disable undocumented functions if possible.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-72529.
| URL | Resource |
|---|---|
| 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72529 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-72529
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-72529 vulnerability anywhere in the article.
-
TheCyberThrone
CISA adds TrueConf and Zimbra and Oracle WebLogic to KEV
August 25, 2026CISA has added multiple vulnerabilities affecting TrueConf Server, Zimbra Collaboration Suite and Oracle HTTP Server/WebLogic Server Proxy Plug-in to its Known Exploited Vulnerabilities ... Read more
The following table lists the changes that have been made to the
CVE-2026-72529 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 21, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-72529', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-20T17:44:08.693101Z'} {'id': 'CVE-2026-72529', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-19T00:00:00+00:00'} -
Initial Analysis by [email protected]
Aug. 20, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:* versions up to (excluding) 5.3.9.10013 *cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:* versions from (including) 5.4.0.12689 up to (excluding) 5.4.9.10072 *cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:* versions from (including) 5.5.0.13826 up to (excluding) 5.5.5.10010 *cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:* versions up to (excluding) 5.3.9.10015 *cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:* versions from (including) 5.4.0.12700 up to (excluding) 5.4.9.10019 *cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:* versions from (including) 5.5.0.13828 up to (excluding) 5.5.5.10009 Added Reference Type Kaspersky Labs: https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function/ Types: Third Party Advisory Added Reference Type CISA-ADP: https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/ Types: Exploit, Third Party Advisory Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72529 Types: US Government Resource -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
Aug. 20, 2026
Action Type Old Value New Value Added Date Added 2026-08-20 Added Due Date 2026-08-20 Added Required Action 2026-08-20 Added Vulnerability Name 2026-08-20 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 20, 2026
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72529 Changed SSVC {'id': 'CVE-2026-72529', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-19T00:00:00+00:00'} {'id': 'CVE-2026-72529', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-20T17:44:08.693101Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 20, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-72529', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-19T17:15:51.122126Z'} {'id': 'CVE-2026-72529', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-19T00:00:00+00:00'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 19, 2026
Action Type Old Value New Value Added Reference https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/ Added SSVC {'id': 'CVE-2026-72529', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-19T17:15:51.122126Z'} -
New CVE Received by [email protected]
Aug. 19, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'TrueConf', 'product': 'TrueConf Server', 'versions': [{'status': 'affected', 'version': '*', 'lessThan': '5.3', 'versionType': 'custom'}, {'status': 'affected', 'version': '5.3', 'lessThan': '5.3.9', 'versionType': 'custom'}, {'status': 'affected', 'version': '5.4', 'lessThan': '5.4.9', 'versionType': 'custom'}, {'status': 'affected', 'version': '5.5', 'lessThan': '5.5.5', 'versionType': 'custom'}], 'platforms': ['Windows', 'Linux'], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-306 Added Reference https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function/