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EUVD-2026-352271

fkie_cve-2026-73423

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.

GHSA-8mv7-9c27-98vc — Astro: composable `astro/hono` pipeline bypasses `security.checkOrigin` when `middleware()` is absent or misordered

Affected: npm: astro

## Summary

In the composable `astro/hono` pipeline, the `security.checkOrigin` protection is only installed by the `middleware()` primitive. The `actions()` and `pages()` primitives each dispatch to user code independently, so a pipeline that mounts either primitive before (or without) `middleware()` will bypass the origin check for those requests.

## Details

`security.checkOrigin` (default: `true`) is intended to reject cross-site `POST`/`PUT`/`PATCH`/`DELETE` form submissions. In the classic pipeline (`astro()` all-in-one), the check always runs because Astro injects a virtual middleware module even when the user has no `src/middleware.ts`. In the composable `astro/hono` pipeline, the user assembles primitives manually. The check is only installed inside `middleware()` — so:

- Mounting `actions()` before `middleware()` allows cross-origin form-encoded action requests to execute before the gate runs. The `examples/advanced-routing` example and the Cloudflare `hono` docs shipped this order. - Omitting `middleware()` entirely (reasonable for apps with no custom middleware) silently drops `checkOrigin` protection for all on-demand endpoints and pages dispatched through `pages()`.

The attack is a blind write-only CSRF: the attacker can trigger a state-mutating action or endpoint handler using the victim's cookies, but cannot read the cross-origin response body.

## Affected versions

Astro `>= 7.0.0` when using the composable `astro/hono` pipeline with either: - `actions()…