CVE-2026-25151 Qwik City has a CSRF Protection Bypass via Content-Type Header Validation

Medium 5.9 Published 3 Feb 2026 Updated 4 Feb 2026

Remote attackers can bypass CSRF protections in Qwik City by manipulating Content-Type headers, allowing unauthorized form submissions.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2026-25151?

CVE-2026-25151 is a medium-severity vulnerability in QwikDev qwik, published on 3 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Qwik is a performance focused javascript framework. Prior to version 1.19.0, 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. This issue has been patched in version 1.19.0.

Weakness: CWE-352

Which versions are affected by CVE-2026-25151?

2 open source packages ship an affected version, including @builder.io/qwik-city. It affects 1 product.

Package	Affected	Fixed in
`@builder.io/qwik-city` npm	All versions	`1.19.0`
`@builder.io/qwik-city` npm	All versions	`1.19.0`

Products include Qwik Qwik.

How do I fix CVE-2026-25151?

Upgrade @builder.io/qwik-city to 1.19.0 or later.

Is CVE-2026-25151 being exploited?

There is no known exploitation of CVE-2026-25151 in the wild and no public exploit code.

Sources

Also known as GHSA-r666-8gjf-4v5f.