CRITICAL • CVSS 4.0

CVE-2026-72530

CISA KNOWN EXPLOITED

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.

Prioritization

NVD CVSS: 9.5
Published: Aug 19, 2026 1:21 PM EDT
Modified: Aug 21, 2026 12:18 AM EDT
CISA KEV: Yes
KEV due date: 2026-09-03

CISA 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.

Red Hat context

No Red Hat-specific cached context is available for this record.

DEFENSIVE REMEDIATION WORKFLOW

Recommended response

Treat as priority because it appears in CISA Known Exploited Vulnerabilities data; follow the required action and due date where applicable.
Identify affected assets with Qualys, Tanium, software inventory, CMDB or configuration-management data.
Confirm package/application applicability before change execution; CVSS alone does not prove that every host is vulnerable.
Patch, upgrade, rehydrate or apply a vendor-approved mitigation through controlled change. GraceITS can automate eligible waves with Ansible/Tanium.
Rescan after remediation and reconcile remaining exceptions, false positives, unsupported systems and compensating controls.

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