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GHSA-r666-8gjf-4v5f

Qwik City has a CSRF Protection Bypass via Content-Type Header Validation

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-25151

Packages

EcosystemPackageAffectedFixed in
npm @builder.io/qwik-city < 1.19.0 1.19.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Summary Qwik City’s server-side request handler inconsistently interprets HTTP request headers, which can be abused by a remote attacker to circumvent form submission CSRF protections using specially crafted or multi-valued Content-Type headers. ### Impact A vulnerability in checkCSRF lets an attacker bypass Origin-based CSRF checks by using malformed or multi-valued Content-Type headers. Exploitation requires the CORS preflight to succeed (so it’s blocked if preflight is denied) and is possible when the application accepts cross-origin requests or via non-browser clients. Impact varies with server CORS and cookie policies and may enable unauthorized state changes.

References

External links from the advisory. They lead to third-party sites.