# CVE-2026-72529 — TrueConf Server

**CISA KEV**

> As of 2026-08-21, CVE-2026-72529 is a CRITICAL-severity vulnerability in TrueConf Server, CVSS v3.1 9.8, EPSS 1.5% (73.2th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-08-20), with a US federal remediation deadline of 2026-08-23. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-72529, most recently “CISA KEV: Active Exploitation of TrueConf Server Vulnerabilities (CVE-2026-72529, CVE-2026-72530) by Head Mare APT”.

**Last updated:** 2026-08-21

## What is CVE-2026-72529?

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.

The record classifies CVE-2026-72529 under weakness class [CWE-306](https://cwe.mitre.org/data/definitions/306.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 34 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **CVSS v4.0 base score:** 9.3 (`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`)
- **EPSS (FIRST):** 1.5% probability of exploitation in the next 30 days, higher than 73.2% of all scored CVEs
- **CISA KEV:** Listed since 2026-08-20, federal remediation deadline 2026-08-23
- **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- **Published:** 2026-08-19, last modified 2026-08-21

## Is CVE-2026-72529 being exploited?

CISA added CVE-2026-72529 to the Known Exploited Vulnerabilities catalog on 2026-08-20, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-08-23 under BOD 22-01. It currently carries a trending score of 57 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **TrueConf**: Server

## How to fix CVE-2026-72529

Because CVE-2026-72529 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-08-23. No vendor patch reference has been recorded for CVE-2026-72529 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-72529

1 tracked threat in the Threadlinqs corpus references CVE-2026-72529, either in the campaign’s CVE list or as an indicator on the campaign record.

- [CISA KEV: Active Exploitation of TrueConf Server Vulnerabilities (CVE-2026-72529, CVE-2026-72530) by Head Mare APT](https://intel.threadlinqs.com/threat/TL-2026-2087) — CRITICAL · 2026-08-20

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-25. This product uses the NVD API but is not endorsed or certified by the NVD.

**Third-party advisory**

- [ics-cert.kaspersky.com — third party advisory](https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-72529
Full detection coverage and IOCs for threats exploiting CVE-2026-72529 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp