Missing authentication
A sensitive function is reachable without proving who is using it.
CWE-306 · CISA KEV; NVD record: vulnerability@kaspersky.com
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Exploited. On CISA's list since 2026-08-20.
TrueConf Server Missing Authentication for Critical Function Vulnerability
CVE-2026-72529 · TrueConf Server · Published 2026-08-19
How bad would it be?
9.3 out of 10
CVSS rates it critical: about as damaging as flaws get.
How likely is it to be used?
1.5%
Estimated chance of exploitation in the next 30 days, higher than 73% of all scored flaws (EPSS, 2026-10-29).
Is it already being used?
Yes
CISA has seen it exploited in real attacks. For US government agencies the fix is deadline passed 68 days ago (2026-08-23).
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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
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.
What the flaw 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 execute an arbitrary script by calling an undocumented function.
From the NVD.
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Exploited flaws from CISA's KEV catalogue. Chance of exploitation from EPSS by FIRST. Descriptions and scores from the NVD. This product uses the NVD API but is not endorsed or certified by the NVD.