{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "helmet-csp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.2.2"
            },
            {
              "fixed": "2.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": true,
    "github_reviewed_at": "2020-08-31T18:50:01Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "Versions of `helmet-csp` before to 2.9.1 are vulnerable to a Configuration Override affecting the application\u0027s Content Security Policy (CSP). The package\u0027s browser sniffing for Firefox deletes the `default-src` CSP policy, which is the fallback policy. This allows an attacker to remove an application\u0027s default CSP, possibly rendering the application vulnerable to Cross-Site Scripting.\n\n\n## Recommendation\n\nUpgrade to version 2.9.1 or later. Setting the `browserSniff` configuration to `false` in vulnerable versions also mitigates the issue.",
  "id": "GHSA-c3m8-x3cg-qm2c",
  "modified": "2021-09-29T18:45:07Z",
  "published": "2020-09-03T20:39:53Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/helmetjs/csp/commit/67a69baafa8198a154f0505a0cf0875f76f6186a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/helmetjs/csp"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-JS-HELMETCSP-469436"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/advisories/1176"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Configuration Override in helmet-csp"
}