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CISA KEV · ACTIVELY EXPLOITED
CRITICAL severity

CVE-2026-72530 — Trueconf Server

CRITICAL

CVE-2026-72530 is a critical-severity (CVSS 9) Code Injection vulnerability in trueconf trueconf server. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-08-20) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

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 use a specially…

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 2, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-08-20. Federal agencies were required to remediate by 2026-09-03.
  • A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2026-72530.

EPSS Exploitation Probability

via FIRST.org ↗
1.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs76th percentile — riskier than 76% of all scored CVEsHighest risk
1.19%1.52%1.85%2.19%1.7%1.7%Oct 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-72530 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 382,205 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

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 use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system.

Affected Products

1 product · 6 configurations
Application
trueconf servertrueconf
≥ 5.5.0.13828 && < 5.5.5.10009
range

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every trueconf trueconf server deployment and check each version against the affected-products list above.

  2. Fix

    Apply the trueconf trueconf server security patch or hotfix for CVE-2026-72530 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

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 use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system.
O3 Security · Runtime Protection

Is CVE-2026-72530 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

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CVE-2026-72530: Trueconf Server RCE (KEV) | O3 Security