MaxKB: Known MCP tool IDs expose owner Tool.code and can be referenced by attacker workflows

{
  "id": "260943c8669e6967d4d944a455880c2af2437abd72194bbf03e2c15718208451",
  "url": "https://osv.dev/vulnerability/CVE-2026-77518",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MaxKB: Known MCP tool IDs expose owner Tool.code and can be referenced by attacker workflows",
    "summary": "MaxKB is an open-source AI assistant for enterprise. In 2.10.2-lts and earlier, a normal workspace user who knows another user's active MCP tool_id in the same workspace can retrieve the hidden tool through the tool-detail route because it does not apply the per-resource authorization used by the list route. The response includes Tool.code, which may contain MCP server configuration and headers, and an attacker who can create or edit an attacker-owned workflow can place the same foreign mcp_tool_id in a workflow mcp-node so workflow debug uses the owner's MCP configuration without verifying permission to use that tool. No fixed version is available as of this review.",
    "evidence": "osv:CVE-2026-77518",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-77518",
      "aliases": [
        "CVE-2026-77518",
        "GHSA-x65c-w438-c58f"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/1panel-dev/maxkb",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "6951bf3d126521a2ba959b2e3d623f2fe4d03bd6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.10.2-lts"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.10.2-lts"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.10.2-lts",
            "v2.10.0-lts",
            "v2.9.2",
            "v2.9.1",
            "v2.9.0",
            "v2.8.1",
            "v2.8.0",
            "v2.7.0",
            "v2.6.1",
            "v2.6.0",
            "v2.5.0",
            "v2.4.0",
            "v2.3.0",
            "v2.2.0",
            "v2.1.0",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0",
            "v1.10.4-lts",
            "v1.10.3-lts",
            "v1.10.2-lts",
            "v1.10.1-lts",
            "v1.10.0-lts",
            "v1.9.0",
            "v1.7.0",
            "v1.6.1",
            "v1.6.0",
            "v1.5.0",
            "v1.4.0",
            "v1.3.0",
            "v1.2.1",
            "v1.2.0",
            "v1.1.3",
            "v1.1.2",
            "v1.1.1",
            "v1.1.0",
            "v1.0.1",
            "v1.0.0",
            "v0.9.1",
            "v0.9.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77518.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.634250799Z",
      "provider": "osv",
      "references": [
        "https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-x65c-w438-c58f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77518.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-77518"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77518.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-77518",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499570,
  "published_at": "2026-09-21T20:36:26.835+00:00"
}