va-26-258-01

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "All information products included in [https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white](https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white) are provided \\\"as is\\\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see [https://us-cert.cisa.gov/tlp/](https://us-cert.cisa.gov/tlp/).",
        "title": "Legal Notice"
      },
      {
        "category": "other",
        "text": "Worldwide",
        "title": "Countries and Areas Deployed"
      },
      {
        "category": "other",
        "text": "Information Technology",
        "title": "Critical Infrastructure Sectors"
      },
      {
        "category": "summary",
        "text": "Tencent Mass Service Engine in Cluster (MSEC) allows a remote, unauthenticated attacker to send a crafted POST request including ../ and gain root access on the target device. An attacker who uploads a webshell can execute arbitrary code as root.",
        "title": "Risk Evaluation"
      },
      {
        "category": "general",
        "text": "No fix available. Repository archived in 2019.",
        "title": "Recommended Practices"
      },
      {
        "category": "other",
        "text": "United States",
        "title": "Company Headquarters Location"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "https://www.cisa.gov/report",
      "issuing_authority": "CISA",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Vulnerability Advisory VA-26-258-02 CSAF",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.json"
      }
    ],
    "title": "Tencent MSEC Path Traversal",
    "tracking": {
      "current_release_date": "2026-09-15T19:50:58Z",
      "generator": {
        "engine": {
          "name": "VINCE-NT",
          "version": "1.15.0+build.129"
        }
      },
      "id": "VA-26-258-01",
      "initial_release_date": "2026-09-15T19:50:58Z",
      "revision_history": [
        {
          "date": "2026-09-15T19:50:58Z",
          "number": "1.0.0",
          "summary": "Initial Publication"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "Tencent Mass Service Engine in Cluster (MSEC) vers:all/*",
                  "product_id": "CSAFPID-0001"
                }
              }
            ],
            "category": "product_name",
            "name": "Mass Service Engine in Cluster (MSEC)"
          }
        ],
        "category": "vendor",
        "name": "Tencent"
      }
    ]
  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Renatto Cecot Sommerer"
          ]
        }
      ],
      "cve": "CVE-2026-89040",
      "cwe": {
        "id": "CWE-22",
        "name": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
      },
      "notes": [
        {
          "category": "summary",
          "text": "Tencent Mass Service Engine in Cluster (MSEC) allows a remote, unauthenticated attacker to send a crafted POST request including ../ and gain root access on the target device. An attacker who uploads a webshell can execute arbitrary code as root.",
          "title": "Description"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:N/A:N/T:T/2026-08-25T15:35:51Z/",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "github.com",
          "url": "https://github.com/Tencent/MSEC"
        },
        {
          "category": "external",
          "summary": "raw.githubusercontent.com",
          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.json"
        },
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-89040"
        }
      ],
      "release_date": "2026-09-15T00:00:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "details": "No fix planned. Repository archived October 2019.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001"
          ]
        }
      ],
      "title": "Tencent Mass Service Engine in Cluster (MSEC) path traversal"
    }
  ]
}