CVE-2026-72529

Published Aug 19, 2026

Last updated 2 months ago

Exploit known CVSS critical 9.3

Zero-day

Supply chain

TrueConf Server

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-72529 is a missing-authentication vulnerability found in TrueConf Server. This flaw allows an unauthenticated remote attacker, with network access to the affected service via TCP port 4307, to execute an arbitrary script. This vulnerability has been observed in active exploitation and is often discussed alongside CVE-2026-72530, a related code injection vulnerability that permits attackers to break out of an isolated environment and execute arbitrary code on the host system. TrueConf has released patched versions (5.3.9, 5.4.9, and 5.5.5) to address this issue.

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.
Source: vulnerability@kaspersky.com
NVD status: Analyzed
Products: trueconf_server

Risk scores

CVSS 4.0

Type: Secondary
Base score: 9.3
Impact score: -
Exploitability score: -
Vector string: 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/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
Severity: CRITICAL

CVSS 3.1

Type: Secondary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Known exploits

Data from CISA

Vulnerability name: TrueConf Server Missing Authentication for Critical Function Vulnerability
Exploit added on: Aug 20, 2026
Exploit action due: Aug 23, 2026
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.

Weaknesses

vulnerability@kaspersky.com: CWE-306

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:*",
            "matchCriteriaId": "223F39D3-6C0B-449C-BBC4-22E9FD1069B0",
            "versionEndExcluding": "5.3.9.10013",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:*",
            "matchCriteriaId": "651E4015-13F5-467A-B994-8CD8CF096F2B",
            "versionEndExcluding": "5.3.9.10015",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:*",
            "matchCriteriaId": "92B109B3-71FC-46C8-9790-602F6E82A1B4",
            "versionEndExcluding": "5.4.9.10072",
            "versionStartIncluding": "5.4.0.12689",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:*",
            "matchCriteriaId": "991CB573-4063-4F9F-980C-73049E0D86BF",
            "versionEndExcluding": "5.4.9.10019",
            "versionStartIncluding": "5.4.0.12700",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:windows:*:*",
            "matchCriteriaId": "BA7EE78E-8CC5-4F6E-8BE2-485C61334D3C",
            "versionEndExcluding": "5.5.5.10010",
            "versionStartIncluding": "5.5.0.13826",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:trueconf:trueconf_server:*:*:*:*:*:linux_kernel:*:*",
            "matchCriteriaId": "1B3BF976-3656-4152-A255-ABA311510C7C",
            "versionEndExcluding": "5.5.5.10009",
            "versionStartIncluding": "5.5.0.13828",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.