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.

We have discovered 725 live websites that are affected by CVE-2026-73423.

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Affected Software

Product	Astro
Category	Static Site Generator
Vulnerable Domains	725 live websites (2.44% of Astro install base)
Vulnerable Versions	from 7 through 7.0.6
Vulnerable Versions Count	6 versions ( 1.27% of all versions)