{
  "id": "GHSA-97rm-xj73-33jh",
  "source": "ghsa",
  "source_url": "https://github.com/advisories/GHSA-97rm-xj73-33jh",
  "summary": "eBay API MCP Server Affected by Environment Variable Injection ",
  "description": "The `ebay_set_user_tokens` tool allows updating the `.env` file with new tokens. The `updateEnvFile` function in `src/auth/oauth.ts` blindly appends or replaces values without validating them for newlines or quotes. This allows an attacker to inject arbitrary environment variables into the configuration file.\n\n### Impact\nAn attacker can inject arbitrary environment variables into the `.env` file. This could lead to:\n- **Configuration Overwrites**: Attackers can overwrite critical settings like `EBAY_REDIRECT_URI` to hijack OAuth flows.\n- **Denial of Service**: Injecting invalid configuration can prevent the server from starting.\n- **Potential RCE**: In some environments, controlling environment variables (like `NODE_OPTIONS`) can lead to Remote Code Execution.\n\nFound with [MCPwner](https://github.com/Pigyon/MCPwner) 🕶",
  "product": "ebay-mcp",
  "severity": "high",
  "cvss": {
    "score": 8.3,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
    "version": "3.1"
  },
  "cwes": [
    "CWE-15",
    "CWE-74"
  ],
  "affected": [
    {
      "ecosystem": "npm",
      "name": "ebay-mcp",
      "vulnerable_range": "<= 1.7.2",
      "patched_version": null
    }
  ],
  "references": [
    {
      "url": "https://github.com/YosefHayim/ebay-mcp/security/advisories/GHSA-97rm-xj73-33jh",
      "ref_type": "advisory",
      "title": null
    },
    {
      "url": "https://github.com/YosefHayim/ebay-mcp/commit/aab0bda75ea9dd27aa37d0d8524d7cf41b3c4a9a",
      "ref_type": "commit",
      "title": null
    },
    {
      "url": "https://github.com/advisories/GHSA-97rm-xj73-33jh",
      "ref_type": "advisory",
      "title": null
    }
  ],
  "aliases": [
    "CVE-2026-27203"
  ],
  "published_at": "2026-02-19T20:27:11Z",
  "ingested_at": "2026-02-20T14:43:26.600778123Z",
  "raw_source": {
    "ghsa_id": "GHSA-97rm-xj73-33jh",
    "cve_id": "CVE-2026-27203",
    "url": "https://api.github.com/advisories/GHSA-97rm-xj73-33jh",
    "html_url": "https://github.com/advisories/GHSA-97rm-xj73-33jh",
    "summary": "eBay API MCP Server Affected by Environment Variable Injection ",
    "description": "The `ebay_set_user_tokens` tool allows updating the `.env` file with new tokens. The `updateEnvFile` function in `src/auth/oauth.ts` blindly appends or replaces values without validating them for newlines or quotes. This allows an attacker to inject arbitrary environment variables into the configuration file.\n\n### Impact\nAn attacker can inject arbitrary environment variables into the `.env` file. This could lead to:\n- **Configuration Overwrites**: Attackers can overwrite critical settings like `EBAY_REDIRECT_URI` to hijack OAuth flows.\n- **Denial of Service**: Injecting invalid configuration can prevent the server from starting.\n- **Potential RCE**: In some environments, controlling environment variables (like `NODE_OPTIONS`) can lead to Remote Code Execution.\n\nFound with [MCPwner](https://github.com/Pigyon/MCPwner) 🕶",
    "type": "reviewed",
    "severity": "high",
    "repository_advisory_url": "https://api.github.com/repos/YosefHayim/ebay-mcp/security-advisories/GHSA-97rm-xj73-33jh",
    "source_code_location": "https://github.com/YosefHayim/ebay-mcp",
    "identifiers": [
      {
        "value": "GHSA-97rm-xj73-33jh",
        "type": "GHSA"
      },
      {
        "value": "CVE-2026-27203",
        "type": "CVE"
      }
    ],
    "references": [
      "https://github.com/YosefHayim/ebay-mcp/security/advisories/GHSA-97rm-xj73-33jh",
      "https://github.com/YosefHayim/ebay-mcp/commit/aab0bda75ea9dd27aa37d0d8524d7cf41b3c4a9a",
      "https://github.com/advisories/GHSA-97rm-xj73-33jh"
    ],
    "published_at": "2026-02-19T20:27:11Z",
    "updated_at": "2026-02-19T20:27:13Z",
    "github_reviewed_at": "2026-02-19T20:27:11Z",
    "nvd_published_at": null,
    "withdrawn_at": null,
    "vulnerabilities": [
      {
        "package": {
          "ecosystem": "npm",
          "name": "ebay-mcp"
        },
        "vulnerable_version_range": "<= 1.7.2",
        "first_patched_version": null,
        "vulnerable_functions": []
      }
    ],
    "cvss_severities": {
      "cvss_v3": {
        "vector_string": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
        "score": 8.3
      },
      "cvss_v4": {
        "vector_string": null,
        "score": 0.0
      }
    },
    "cwes": [
      {
        "cwe_id": "CWE-15",
        "name": "External Control of System or Configuration Setting"
      },
      {
        "cwe_id": "CWE-74",
        "name": "Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')"
      }
    ],
    "credits": [
      {
        "user": {
          "login": "nedlir",
          "id": 66902031,
          "node_id": "MDQ6VXNlcjY2OTAyMDMx",
          "avatar_url": "https://avatars.githubusercontent.com/u/66902031?v=4",
          "gravatar_id": "",
          "url": "https://api.github.com/users/nedlir",
          "html_url": "https://github.com/nedlir",
          "followers_url": "https://api.github.com/users/nedlir/followers",
          "following_url": "https://api.github.com/users/nedlir/following{/other_user}",
          "gists_url": "https://api.github.com/users/nedlir/gists{/gist_id}",
          "starred_url": "https://api.github.com/users/nedlir/starred{/owner}{/repo}",
          "subscriptions_url": "https://api.github.com/users/nedlir/subscriptions",
          "organizations_url": "https://api.github.com/users/nedlir/orgs",
          "repos_url": "https://api.github.com/users/nedlir/repos",
          "events_url": "https://api.github.com/users/nedlir/events{/privacy}",
          "received_events_url": "https://api.github.com/users/nedlir/received_events",
          "type": "User",
          "user_view_type": "public",
          "site_admin": false
        },
        "type": "reporter"
      }
    ],
    "cvss": {
      "vector_string": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
      "score": 8.3
    }
  }
}