CVE-2026-25151
Qwik City has a CSRF Protection Bypass via Content-Type Header Validation
Impact
### 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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @builder.io/qwik-city | < 1.19.0 | 1.19.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Qwik | Qwik | before 1.19.0 |