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Known exploited vulnerability

CVE-2026-72530

criticalCVSS 4.0 9.5In CISA KEVEPSS 1.7%Published · TrueConf

The short answer

CVE-2026-72530 affects TrueConf TrueConf Server and is rated critical (CVSS 9.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-08-20: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-94.

Severity

9.5 critical

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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

Exploited (CISA KEV)

Yes, since Aug 20, 2026

Federal due date Sep 3, 2026

EPSS, next 30 days

1.7%

Higher than 77% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
High
Attack requirements
Present
Privileges required
None
User interaction
None
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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…

Affected products

TrueConf Server. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-72530 being exploited?

Yes. CISA added CVE-2026-72530 to its Known Exploited Vulnerabilities catalog on 2026-08-20, with a federal remediation due date of 2026-09-03.

How do I fix CVE-2026-72530?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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