{"id":"CVE-2026-73423","aliases":["GHSA-8mv7-9c27-98vc"],"url":"https://o3.security/vulnerability/CVE-2026-73423","summary":"Astro: composable `astro/hono` pipeline bypasses `security.checkOrigin` when `middleware()` is absent or misordered","details":"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.","published":"2026-08-12T20:35:32.181Z","modified":"2026-08-13T04:02:59.019318482Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"astro","fixedVersion":"7.0.6"}],"fix":{"url":"https://github.com/withastro/astro/commit/0b30b35f864310bee8485c952d1877e82e2b9b1a","label":"withastro/astro@0b30b35"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73423.json"},{"type":"FIX","url":"https://github.com/withastro/astro/commit/0b30b35f864310bee8485c952d1877e82e2b9b1a"},{"type":"FIX","url":"https://github.com/withastro/astro/pull/17250"},{"type":"WEB","url":"https://github.com/withastro/astro/releases/tag/astro@7.0.6"},{"type":"ADVISORY","url":"https://github.com/withastro/astro/security/advisories/GHSA-8mv7-9c27-98vc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73423"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-13T04:02:59.019318482Z"}}