Vulnerability details

CVE-2026-72529

Actively exploited

TrueConf Server

CVSS 4.0

9.3Critical

Official 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 scores

Score	Version	Source	Vector
9.3Critical	4.0	CVEProject cvelistV5 (CNA) (Kaspersky)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
9.8Critical	3.1	CVEProject cvelistV5 (CNA) (Kaspersky)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
TrueConf	TrueConf Server	v < 5.3	CVEProject cvelistV5 (CNA)
TrueConf	TrueConf Server	5.3 ≤ v < 5.3.9	CVEProject cvelistV5 (CNA)
TrueConf	TrueConf Server	5.4 ≤ v < 5.4.9	CVEProject cvelistV5 (CNA)
TrueConf	TrueConf Server	5.5 ≤ v < 5.5.5	CVEProject cvelistV5 (CNA)

References and advisories

https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function/ third-party-advisory
https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/ related
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72529 government-resource

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Details

Published: 2026-08-19
Last updated: 2026-08-21
State: Published
Assigner (CNA): Kaspersky
Kolun priority: 72 · High

CISA KEV catalog

Date added: 2026-08-20
Due date: 2026-08-23
Used in ransomware: Unknown

Exploit prediction (EPSS)

1.46%

Probability of exploitation in 30 days

73.8%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Active
Technical impact: Total

Weaknesses (CWE)

CWE-306
Missing Authentication for Critical Function