{"id":"CVE-2023-29003","aliases":["GHSA-5p75-vc5g-8rv2"],"url":"https://o3.security/vulnerability/CVE-2023-29003","summary":"SvelteKit has Insufficient Cross-Site Request Forgery Protection","details":"SvelteKit is a web development framework. The SvelteKit framework offers developers an option to create simple REST APIs. This is done by defining a `+server.js` file, containing endpoint handlers for different HTTP methods.\n\nSvelteKit provides out-of-the-box cross-site request forgery (CSRF) protection to its users. While the implementation does a sufficient job in mitigating common CSRF attacks, prior to version 1.15.1, the protection can be bypassed by simply specifying a different `Content-Type` header value.\n\nIf abused, this issue will allow malicious requests to be submitted from third-party domains, which can allow execution of operations within the context of the victim's session, and in extreme scenarios can lead to unauthorized access to users’ accounts.\n\nSvelteKit 1.15.1 updates the `is_form_content_type` function call in the CSRF protection logic to include `text/plain`. As additional hardening of the CSRF protection mechanism against potential method overrides, SvelteKit 1.15.1 is now performing validation on `PUT`, `PATCH` and `DELETE` methods as well. This latter hardening is only needed to protect users who have put in some sort of `?_method= override` feature themselves in their `handle` hook, so that the request that resolve sees could be `PUT`/`PATCH`/`DELETE` when the browser issues a `POST` request.","published":"2023-04-04T21:20:43.983Z","modified":"2026-08-08T03:47:44.752288783Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"@sveltejs/kit","fixedVersion":"1.15.1"}],"fix":{"url":"https://github.com/sveltejs/kit/commit/bb2253d51d00aba2e4353952d4fb0dcde6c77123","label":"sveltejs/kit@bb2253d"},"references":[{"type":"WEB","url":"https://github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%401.15.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/29xxx/CVE-2023-29003.json"},{"type":"ADVISORY","url":"https://github.com/sveltejs/kit/security/advisories/GHSA-5p75-vc5g-8rv2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-29003"},{"type":"FIX","url":"https://github.com/sveltejs/kit/commit/bb2253d51d00aba2e4353952d4fb0dcde6c77123"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-08T03:47:44.752288783Z"}}