# CVE-2026-84376

## Summary

- **CVE ID:** CVE-2026-84376
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-187
- **Published:** Sep 2, 2026
- **Last Modified:** Sep 4, 2026

## Description

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.

## Affected Products

- withastro — astro (< 7.2.4)

## References

- [CNA](https://github.com/withastro/astro/security/advisories/GHSA-376h-93r7-7g6f)
- [CNA](https://github.com/withastro/astro/pull/17701)
- [CNA](https://github.com/withastro/astro/commit/05763a0884aabb1da78a2749d5bb9d41ae620527)
- [CNA](https://github.com/withastro/astro/releases/tag/astro@7.2.4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.41%
- **EPSS Percentile:** 34.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._