SvelteKit framework has Insufficient CSRF protection for CORS requests
Description
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.
SvelteKit provides out-of-the-box cross-site request forgery (CSRF) protection to its users. The protection is implemented at kit/src/runtime/server/respond.js. While the implementation does a sufficient job of mitigating common CSRF attacks, the protection can be bypassed in versions prior to 1.15.2 by simply specifying an upper-cased Content-Type header value. The browser will not send uppercase characters, but this check does not block all expected CORS requests.
If 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. This may lead to all POST operations requiring authentication being allowed in the following cases: If the target site sets SameSite=None on its auth cookie and the user visits a malicious site in a Chromium-based browser; if the target site doesn't set the SameSite attribute explicitly and the user visits a malicious site with Firefox/Safari with tracking protections turned off; and/or if the user is visiting a malicious site with a very outdated browser.
SvelteKit 1.15.2 contains a patch for this issue. It is also recommended to explicitly set SameSite to a value other than None on authentication cookies especially if the upgrade cannot be done in a timely manner.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@sveltejs/kitnpm | < 1.15.2 | 1.15.2 |
Affected products
1Patches
1ba436c6685e7Merge pull request from GHSA-gv7g-x59x-wf8f
3 files changed · +9 −3
.changeset/happy-pots-move.md+5 −0 added@@ -0,0 +1,5 @@ +--- +'@sveltejs/kit': patch +--- + +fix: address security advisory CVE-2023-29008 by doing a case-insensitive comparison when checking header value
packages/kit/src/utils/http.js+2 −2 modified@@ -59,9 +59,9 @@ export function negotiate(accept, types) { * @param {Request} request * @param {...string} types */ -export function is_content_type(request, ...types) { +function is_content_type(request, ...types) { const type = request.headers.get('content-type')?.split(';', 1)[0].trim() ?? ''; - return types.includes(type); + return types.includes(type.toLowerCase()); } /**
packages/kit/test/apps/basics/test/server.test.js+2 −1 modified@@ -61,7 +61,8 @@ test.describe('CSRF', () => { const content_types = [ 'application/x-www-form-urlencoded', 'multipart/form-data', - 'text/plain' + 'text/plain', + 'text/plaiN' ]; const methods = ['POST', 'PUT', 'PATCH', 'DELETE']; for (const method of methods) {
Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
4- github.com/advisories/GHSA-gv7g-x59x-wf8fghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2023-29008ghsaADVISORY
- github.com/sveltejs/kit/commit/ba436c6685e751d968a960fbda65f24cf7a82e9fghsax_refsource_MISCWEB
- github.com/sveltejs/kit/security/advisories/GHSA-gv7g-x59x-wf8fghsax_refsource_CONFIRMWEB
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