Vulnerability-Lookup

GHSA-XC2X-Q39J-746F

Vulnerability from github – Published: 2026-08-19 18:32 – Updated: 2026-08-20 18:30

Details

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.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.3 (Critical)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72529"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-19T17:21:00Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-xc2x-q39j-746f",
  "modified": "2026-08-20T18:30:42Z",
  "published": "2026-08-19T18:32:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72529"
    },
    {
      "type": "WEB",
      "url": "https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function"
    },
    {
      "type": "WEB",
      "url": "https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72529"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-72529 (GCVE-0-2026-72529)

Vulnerability from cvelistv5 – Published: 2026-08-19 16:55 – Updated: 2026-08-21 03:55

Summary

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-19 00:00 UTC

CWE

CWE-306 - Missing Authentication for Critical Function

Assigner

Kaspersky mitre root

References

3 references

URL	Tags
https://ics-cert.kaspersky.com/advisories/2026/08…	third-party-advisory
https://securelist.com/tr/head-mare-targets-truec…	related
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

1 product

Vendor	Product	Version
TrueConf	TrueConf Server	Affected: * , < 5.3 (custom) Affected: 5.3 , < 5.3.9 (custom) Affected: 5.4 , < 5.4.9 (custom) Affected: 5.5 , < 5.5.5 (custom)

Credits

Vyacheslav Kopeytsev from Kaspersky ICS CERT

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-72529",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-19T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2026-08-20",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72529"
              },
              "type": "kev"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-21T03:55:16.895Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "related"
            ],
            "url": "https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/"
          },
          {
            "tags": [
              "government-resource"
            ],
            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72529"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-08-20T00:00:00.000Z",
            "value": "CVE-2026-72529 added to CISA KEV"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "Windows",
            "Linux"
          ],
          "product": "TrueConf Server",
          "vendor": "TrueConf",
          "versions": [
            {
              "lessThan": "5.3",
              "status": "affected",
              "version": "*",
              "versionType": "custom"
            },
            {
              "lessThan": "5.3.9",
              "status": "affected",
              "version": "5.3",
              "versionType": "custom"
            },
            {
              "lessThan": "5.4.9",
              "status": "affected",
              "version": "5.4",
              "versionType": "custom"
            },
            {
              "lessThan": "5.5.5",
              "status": "affected",
              "version": "5.5",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Vyacheslav Kopeytsev from Kaspersky ICS CERT"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "cvssV4_0": {
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "vectorString": "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",
            "version": "4.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-306",
              "description": "CWE-306: Missing Authentication for Critical Function",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:55:14.949Z",
        "orgId": "e45d732a-8f6b-4b6b-be76-7420f6a2b988",
        "shortName": "Kaspersky"
      },
      "references": [
        {
          "name": "KLCERT-26-057: TrueConf Server. Missing Authentication for Critical Function",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function/"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Update TrueConf server to versions 5.3.9, 5.4.9 or 5.5.5."
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-08-03T00:00:00.000Z",
          "value": "Issue discovered by Kaspersky ICS CERT and reported to TrueConf"
        },
        {
          "lang": "en",
          "time": "2026-08-04T00:00:00.000Z",
          "value": "Issue confirmed by TrueConf"
        },
        {
          "lang": "en",
          "time": "2026-08-07T00:00:00.000Z",
          "value": "Advisory published by Kaspersky ICS CERT"
        }
      ],
      "workarounds": [
        {
          "lang": "en",
          "value": "Perform a full check with anti-virus software that has up-to-date anti-virus databases and software modules."
        },
        {
          "lang": "en",
          "value": "Conduct a scan for indicators of compromise. In the event of detecting indicators of compromise, change passwords for accounts that may have been compromised and contact Kaspersky ICS CERT at ics-cert@kaspersky.com for further instructions and assistance in investigating the incident."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "e45d732a-8f6b-4b6b-be76-7420f6a2b988",
    "assignerShortName": "Kaspersky",
    "cveId": "CVE-2026-72529",
    "datePublished": "2026-08-19T16:55:14.949Z",
    "dateReserved": "2026-08-10T09:55:18.375Z",
    "dateUpdated": "2026-08-21T03:55:16.895Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-XC2X-Q39J-746F

CVE-2026-72529 (GCVE-0-2026-72529)

Tags

Sightings

Nomenclature