by Kastro
Paper/Archive/CVE-2026-33768

CVE-2026-33768

withastro astro — Astro: Unauthenticated Path Override via `x-astro-path` / `x_astro_path`

EPSS 0.3%public exploitCVSS 9.1
critical.is priorityof 100
43
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 27.9.279 × 205.6Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
astro< 10.0.2–CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub_M (CNA)6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: partial

References

refgithub.com/withastro/astro/security/advisories/GHSA-mr6q-rp88-fx84refgithub.com/withastro/astro/pull/15959refgithub.com/withastro/astro/commit/335a204161f5a7293c128db570901d4f8639c6edrefgithub.com/withastro/astro/releases/tag/%40astrojs%2Fvercel%4010.0.2