{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.4.2"
              },
              {
                "fixed": "1.7.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "1f90faae26935a7c16efaaf7e8251d551efae2c0"
            },
            {
              "fixed": "9fd514292d23d59ca1434b01f019aca6ef4356f9"
            }
          ],
          "repo": "https://github.com/arikusi/deepseek-mcp-server",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-fh3r-g96v-f578"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55604.json"
  },
  "details": "DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.7.0, the process-global `SessionStore` accepts caller-supplied `session_id` values without binding them to any authenticated principal or transport session. An attacker can enumerate active session IDs via `deepseek_sessions`, then reuse a victim-controlled `session_id` in `deepseek_chat` to retrieve and continue the victim's conversation context. Version 1.7.0 contains a patch.",
  "id": "CVE-2026-55604",
  "modified": "2026-07-15T01:48:58.875642569Z",
  "published": "2026-07-09T21:13:15.713Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55604.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55604"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key"
}