{"id":"CVE-2023-29003","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-29003","generatedAt":"2026-10-27T23:58:21.508Z","title":"SvelteKit provides out-of-the-box cross-site request forgery (CSRF) protection to its users.","description":"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":"2023-04-04T22:15:08.000Z","lastModified":"2026-06-17T05:49:10.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","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"},"cwe":["CWE-184","CWE-352"],"affected":["svelte/sveltekit"],"epss":{"score":0.00557,"percentile":0.46172,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.56%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/sveltejs/kit/commit/bb2253d51d00aba2e4353952d4fb0dcde6c77123","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%401.15.1","tags":["Patch","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/sveltejs/kit/security/advisories/GHSA-5p75-vc5g-8rv2","tags":["Exploit","Mitigation","Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/sveltejs/kit/commit/bb2253d51d00aba2e4353952d4fb0dcde6c77123","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%401.15.1","tags":["Patch","Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/sveltejs/kit/security/advisories/GHSA-5p75-vc5g-8rv2","tags":["Exploit","Mitigation","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-29003","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}