Astro: Authorization bypass from missing path-segment boundary check when stripping the configured base
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| withastro | astro | before 7.2.4 | 7.2.4 | Patch available | CNA |
| — | astro (npm) | before 7.2.4 | 7.2.4 | Patch available | GHSA-376h-93r7-7g6f |
- astro Vendorwithastro Affected before 7.2.4 Fixed in 7.2.4 Patch available CNA
- astro (npm) Vendor— Affected before 7.2.4 Fixed in 7.2.4 Patch available GHSA-376h-93r7-7g6f
Remediation
- Fix · CNA astro (withastro) Fixed in 7.2.4
- Fix · GHSA-376h-93r7-7g6f astro (npm) Fixed in 7.2.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-84376
- 2026-10-03 Alias added: GHSA-376h-93r7-7g6f
References
Other 5
- https://github.com/withastro/astro/security/advisories/GHSA-376h-93r7-7g6f
- https://github.com/withastro/astro/pull/17701
- https://github.com/withastro/astro/commit/05763a0884aabb1da78a2749d5bb9d41ae620527
- https://github.com/withastro/astro/releases/tag/[email protected]
- https://github.com/withastro/astro
More withastro vulnerabilities
- TI-2026-26147 Astro: Unauthenticated Path Override via `x-astro-path` / `x_astro_path` CVSS 3.1CRITICAL 9.1
- TI-2026-42600 Astro 6.4.7 Authorization Bypass via Decode Iteration Limit and Rewrite Path Canonicalization Mismatch CVSS 3.1HIGH 8.2
- TI-2024-37142 Server source code is exposed to the public if sourcemaps are enabled CVSS 4.0HIGH 7.8
- TI-2025-35987 Astro Cloudflare adapter is vulnerable to Server-Side Request Forgery via /_image endpoint CVSS 3.1HIGH 7.2
- TI-2025-34958 Unauthorized third-party images in Astro’s _image endpoint CVSS 4.0MEDIUM 6.9
- TI-2026-51542 Astro: Unauthenticated path override in the @astrojs/vercel ISR function CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-84376 · CVE Program
- CVE-2026-84376 · NVD
- FIRST EPSS
- GHSA-376h-93r7-7g6f · GitHub Advisory Database · CC BY 4.0
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