CVE-2026-33768
Received Received - Intake
Path Traversal in Astro @astrojs/vercel Enables Auth Bypass

Publication date: 2026-03-24

Last updated on: 2026-03-26

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2026-03-24
Last Modified
2026-03-26
Generated
2026-06-16
AI Q&A
2026-03-24
EPSS Evaluated
2026-06-15
NVD
CVE-2026-33768
EUVD
EUVD-2026-14982
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
astro @astrojs/vercel to 10.0.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
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.
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Detection Guidance

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Mitigation Strategies

To mitigate this vulnerability, upgrade the @astrojs/vercel serverless entrypoint to version 10.0.2 or later, where the issue has been patched.

Executive Summary

This vulnerability exists in the Astro web framework prior to version 10.0.2, specifically in the @astrojs/vercel serverless entrypoint. It improperly reads the x-astro-path header and x_astro_path query parameter to rewrite the internal request path without any authentication.

Because of this, on deployments that do not use Edge Middleware, anyone can bypass Vercel's platform-level path restrictions. The rewritten path preserves the original HTTP method and body, meaning that not only GET requests but also POST, PUT, and DELETE requests can be redirected to restricted paths.

For example, a firewall rule blocking access to /admin/* paths can be bypassed by sending a POST request to /api/health with the query parameter x_astro_path=/admin/delete-user, effectively allowing unauthorized access to restricted endpoints.

This issue was fixed in version 10.0.2 of Astro.

Impact Analysis

This vulnerability can allow an attacker to bypass platform-level path restrictions and access or modify restricted resources without authentication.

Since the vulnerability allows rewriting of internal request paths while preserving HTTP methods and bodies, attackers can perform unauthorized actions such as deleting users or modifying sensitive data by sending crafted requests.

This can lead to unauthorized information disclosure, data modification, or other malicious activities depending on the protected endpoints that are bypassed.

Compliance Impact

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