withastro Astro up to 7.2.3 Base Path improper authorization

Summaryinfo

A vulnerability, which was classified as critical, has been found in withastro Astro up to 7.2.3. Affected by this issue is some unknown functionality of the component Base Path. This manipulation causes improper authorization. This vulnerability is registered as CVE-2026-84376. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in withastro Astro up to 7.2.3 and classified as critical. Affected by this vulnerability is an unknown functionality of the component Base Path. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Astro is a web framework for content-driven websites. Prior to 7.2.4, Astro stripped a configured non-root base path from request pathnames using a string-prefix check without verifying a path-segment boundary. With base "/app", a request to "/appX/admin" resolved internally to the protected "/admin" route while middleware observed "/appX/admin" in context.url.pathname. In applications that authorize base-prefixed routes by inspecting context.url.pathname, an unauthenticated remote attacker could bypass pathname-based middleware authorization and reach protected routes. This issue is fixed in version 7.2.4.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-84376 since 09/01/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 7.2.4 eliminates this vulnerability.

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Productinfo

Vendor

• withastro

Name

• Astro

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3

Website

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

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