{"id":"CVE-2024-56140","aliases":["GHSA-c4pw-33h3-35xw"],"url":"https://o3.security/vulnerability/CVE-2024-56140","summary":"Bypass of CSRF Middleware in Astro","details":"Astro is a web framework for content-driven websites. In affected versions a bug in Astro’s CSRF-protection middleware allows requests to bypass CSRF checks. When the `security.checkOrigin` configuration option is set to `true`, Astro middleware will perform a CSRF check. However, a vulnerability exists that can bypass this security. A semicolon-delimited parameter is allowed after the type in `Content-Type`. Web browsers will treat a `Content-Type` such as `application/x-www-form-urlencoded; abc` as a `simple request` and will not perform preflight validation. In this case, CSRF is not blocked as expected. Additionally, the `Content-Type` header is not required for a request. This issue has been addressed in version 4.16.17 and all users are advised to upgrade. There are no known workarounds for this vulnerability.","published":"2024-12-18T20:41:06.806Z","modified":"2026-08-08T03:47:36.454389595Z","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":"astro","fixedVersion":"4.16.17"}],"fix":{"url":"https://github.com/withastro/astro/commit/e7d14c374b9d45e27089994a4eb72186d05514de","label":"withastro/astro@e7d14c3"},"references":[{"type":"WEB","url":"https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#simple_requests"},{"type":"WEB","url":"https://github.com/withastro/astro/blob/6031962ab5f56457de986eb82bd24807e926ba1b/packages/astro/src/core/app/middlewares.ts"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56140.json"},{"type":"ADVISORY","url":"https://github.com/withastro/astro/security/advisories/GHSA-c4pw-33h3-35xw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-56140"},{"type":"FIX","url":"https://github.com/withastro/astro/commit/e7d14c374b9d45e27089994a4eb72186d05514de"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-08T03:47:36.454389595Z"}}