Reflected XSS vulnerability in keter

{
  "affected": [
    {
      "database_specific": {
        "human_link": "https://github.com/haskell/security-advisories/tree/main/advisories/published/2024/HSEC-2024-0001.md",
        "osv": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export/2024/HSEC-2024-0001.json"
      },
      "package": {
        "ecosystem": "Hackage",
        "name": "keter"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.3.4"
            },
            {
              "fixed": "1.8.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "database_specific": {
    "home": "https://github.com/haskell/security-advisories",
    "osvs": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export",
    "repository": "https://github.com/haskell/security-advisories"
  },
  "details": "# Reflected XSS vulnerability in keter\n\nKeter is an app-server/reverse-proxy often used with webapps build on Yesod web-framework.\n\nIn the logic handling VHost dispatch, Keter was echoing back `Host` header value, unescaped,\nas part of an HTML error page. This constitutes a reflected-XSS vulnerability. Although\nnot readily exploitable directly from a browser (where `Host` header can\u0027t generally assume\narbitrary values), it may become such in presence of further weaknesses in components\nupstream of Keter in the http proxying chain. Therefore, AC:High in CVSS evaluation.\n",
  "id": "HSEC-2024-0001",
  "modified": "2025-11-14T14:45:34Z",
  "published": "2025-11-14T14:45:34Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/snoyberg/keter/pull/246"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "Reflected XSS vulnerability in keter"
}