Critical severity · published Aug 19, 2026
CVE-2026-72529
TrueConf Server Missing Authentication for Critical Function Vulnerability
In wildKEV
9.8
CVSS
1.5%
EPSS
Yes
On KEV
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 execute an arbitrary script by calling an undocumented function.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% of CVEs
Exploited in the wildYes
CISA KEVListed Aug 20, 2026
Federal remediation dueAug 23, 2026
Ransomware campaign useNot known
Affected products
Which versions
TS
TrueConf Server · TrueConf
before 5.3; 5.3 before 5.3.9; 5.4 before 5.4.9; 5.5 before 5.5.5 · source: vendor, NVD
SE
Server · TrueConf
All versions, or not specified · source: KEV
In the news
VulnerabilityHigh
CISA Adds Two Known Exploited Vulnerabilities to Catalog
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation.
CVE-2026-72529 TrueConf Server Missing Authentication for Critical Function Vulnerability
CVE-2026-72530 TrueConf Server Code Injection Vulnerability
These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise.
Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied.
While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities . CISA will continue to add vulnerabilities to the catalog that meet the specified criteria .
Aware of an exploit...
Aug 20, 2026·CISA Advisories
VulnerabilityHigh
[CISA KEV] CVE-2026-72529: TrueConf Server - TrueConf Server Missing Authentication for Critical Function Vulnerability
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.
SEServerCVE-2026-72529
Aug 20, 2026·CISA KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-72529
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-72529
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
third-party-advisory
https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function/
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