CVE-2026-55240

{
  "id": "CVE-2026-55240",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-15T19:17:40.290",
  "lastModified": "2026-10-28T20:18:08.730",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "msgbyte",
          "product": "tianji",
          "versions": [
            {
              "version": "< 1.31.29",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "HIGH",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-28T20:04:51.050574Z",
          "id": "CVE-2026-55240",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1336"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/msgbyte/tianji/commit/132ff67907df897d222829ea8ad1a018ff74df48",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/msgbyte/tianji/releases/tag/v1.31.29",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/msgbyte/tianji/security/advisories/GHSA-5grg-j3cr-3hpm",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/msgbyte/tianji/security/advisories/GHSA-5grg-j3cr-3hpm",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}