Summaryinfo

A vulnerability, which was classified as critical, has been found in withastro astro up to 10.0.1. The impacted element is an unknown function of the component Query Parameter Handler. This manipulation of the argument x_astro_path causes confused deputy. This vulnerability appears as CVE-2026-33768. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in withastro astro up to 10.0.1. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component Query Parameter Handler. The manipulation of the argument x_astro_path with an unknown input leads to a confused deputy vulnerability. The CWE definition for the vulnerability is CWE-441. The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Astro is a web framework. Prior to version 10.0.2, the @astrojs/vercel serverless entrypoint reads the x-astro-path header and x_astro_path query parameter to rewrite the internal request path, with no authentication whatsoever. On deployments without Edge Middleware, this lets anyone bypass Vercel's platform-level path restrictions entirely. The override preserves the original HTTP method and body, so this isn't limited to GET. POST, PUT, DELETE all land on the rewritten path. A Firewall rule blocking /admin/* does nothing when the request comes in as POST /api/health?x_astro_path=/admin/delete-user. This issue has been patched in version 10.0.2.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-33768 since 03/23/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 10.0.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 335a204161f5a7293c128db570901d4f8639c6ed is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-14982). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• withastro

Name

• astro

Version

• 10.0.0
• 10.0.1

License

• open-source

Website

• Product: https://github.com/withastro/astro/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Discussion