Vulnerability-Lookup

FKIE_CVE-2026-72530

Vulnerability from fkie_nvd - Published: 2026-08-19 17:21 - Updated: 2026-08-21 04:18

Severity

9.0 (Critical) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Summary

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 use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system.

References

URL	Tags
vulnerability@kaspersky.com	https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isolated-environment/	Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/	Exploit, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72530	US Government Resource

Impacted products

Vendor	Product	Version
trueconf	trueconf_server	*
trueconf	trueconf_server	*
trueconf	trueconf_server	*
trueconf	trueconf_server	*
trueconf	trueconf_server	*
trueconf	trueconf_server	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "vulnerability@kaspersky.com"
    }
  ],
  "cisaActionDue": "2026-09-03",
  "cisaExploitAdd": "2026-08-20",
  "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (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\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "cisaVulnerabilityName": "TrueConf Server Code Injection Vulnerability",
  "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"
        }
      ]
    }
  ],
  "cveTags": [],
  "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 use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system."
    }
  ],
  "id": "CVE-2026-72530",
  "lastModified": "2026-08-21T04:18:15.903",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.0,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 6.0,
        "source": "vulnerability@kaspersky.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.5,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "vulnerability@kaspersky.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-72530",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-19T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-19T17:21:01.130",
  "references": [
    {
      "source": "vulnerability@kaspersky.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isolated-environment/"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://securelist.com/tr/head-mare-targets-trueconf-server-with-phantomcore/120988/"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-72530"
    }
  ],
  "sourceIdentifier": "vulnerability@kaspersky.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "vulnerability@kaspersky.com",
      "type": "Secondary"
    }
  ]
}

CVE-2026-72530 (GCVE-0-2026-72530)

Vulnerability from cvelistv5 – Published: 2026-08-19 16:56 – Updated: 2026-08-21 03:55

Summary

Severity

9 (Critical)


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

SSVC

Exploitation: active Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-19 00:00 UTC

CWE

CWE-94 - Code Injection

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

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-72530",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "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-2026-72530"
              },
              "type": "kev"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-21T03:55:18.512Z",
          "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-2026-72530"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-08-20T00:00:00.000Z",
            "value": "CVE-2026-72530 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 use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "cvssV4_0": {
            "baseScore": 9.5,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
            "version": "4.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-94",
              "description": "CWE-94: Code Injection",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:56:53.099Z",
        "orgId": "e45d732a-8f6b-4b6b-be76-7420f6a2b988",
        "shortName": "Kaspersky"
      },
      "references": [
        {
          "name": "KLCERT-26-058: TrueConf Server. Break out of the isolated environment",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isolated-environment/"
        }
      ],
      "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-2026-72530",
    "datePublished": "2026-08-19T16:56:53.099Z",
    "dateReserved": "2026-08-10T09:55:18.375Z",
    "dateUpdated": "2026-08-21T03:55:18.512Z",
    "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

FKIE_CVE-2026-72530

CVE-2026-72530 (GCVE-0-2026-72530)

Tags

Sightings

Nomenclature