Tianji: Remote Code Execution via lodash template evaluate pattern in survey feed templates

{
  "id": "25d709173f6cb3f518ca1c95a0f721fee457d3cc71d7432a806273b0308b3e2b",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-55240",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Tianji: Remote Code Execution via lodash template evaluate pattern in survey feed templates",
    "summary": "Tianji is an open source analytics, uptime monitoring, and server status platform. Prior to 1.31.29, formatString() in src/server/utils/template.ts passes survey feedTemplate and monitor notification templates to lodash template(), while the default evaluate pattern remains enabled. A workspace administrator can store an evaluate block using the <% code %> form, and the public survey.submit endpoint renders a survey template when an unauthenticated user submits a response. The compiled template executes server-side JavaScript in the Tianji Node.js process, allowing command execution, secret disclosure, data modification, or service disruption. This issue is fixed in version 1.31.29.",
    "evidence": "cve:CVE-2026-55240",
    "products": [
      {
        "name": {
          "value": "tianji",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-55240",
      "aliases": [
        "CVE-2026-55240"
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "scope": "CHANGED",
            "version": "3.1",
            "baseScore": 9.1,
            "attackVector": "NETWORK",
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "integrityImpact": "HIGH",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "availabilityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "confidentialityImpact": "HIGH"
          }
        }
      ],
      "affected": [
        {
          "vendor": "msgbyte",
          "product": "tianji",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.31.29"
            }
          ]
        }
      ],
      "modified": "2026-10-28T20:04:59.360Z",
      "provider": "cve",
      "references": [
        "https://github.com/msgbyte/tianji/security/advisories/GHSA-5grg-j3cr-3hpm",
        "https://github.com/msgbyte/tianji/commit/132ff67907df897d222829ea8ad1a018ff74df48",
        "https://github.com/msgbyte/tianji/releases/tag/v1.31.29"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-55240",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-28T20:04:51.050574Z"
                  }
                }
              }
            ],
            "references": [
              {
                "url": "https://github.com/msgbyte/tianji/security/advisories/GHSA-5grg-j3cr-3hpm",
                "tags": [
                  "exploit"
                ]
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-28T20:04:59.360Z"
            }
          }
        ],
        "cna": {
          "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-15T18:15:12.957Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-55240",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 484700,
  "published_at": "2026-10-15T18:15:12.957+00:00"
}