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Medium · 5.1 CVE-2026-73423 EUVD-2026-57608GHSA-8mv7-9c27-98vc

Astro: composable `astro/hono` pipeline bypasses `security.checkOrigin` when `middleware()` is absent or misordered

Published Aug 12, 2026 · Updated Aug 13, 2026 · Assigned by GitHub_M

Description

Astro is a web framework for content-driven websites. From 7.0.0 until 7.0.6, the composable astro/hono pipeline installs security.checkOrigin only through the middleware() primitive, while actions() and pages() can dispatch to user code independently. Mounting actions() before middleware(), as in the examples/advanced-routing example and Cloudflare Hono documentation, allows cross-origin form-encoded action requests to execute before the origin check, and using pages() without middleware() drops the check for on-demand endpoints and pages. The flaw enables blind write-only cross-site request forgery using the victim's cookies against ActionHandler.handle and PagesHandler.handleWithErrorFallback when manifest.checkOrigin is enabled; the attacker can trigger a state-mutating action or endpoint handler but cannot read the cross-origin response. The default non-composable astro() pipeline is not affected. This issue is fixed in version 7.0.6.

Affected products

VendorProductAffectedFixed
withastro astro >= 7.0.0, < 7.0.6 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm astro >= 7.0.0, < 7.0.6 7.0.6 GHSA-8mv7-9c27-98vc

References