{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "7.0.0"
              },
              {
                "fixed": "7.0.6"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "f55ba4caca7c587555da86e3211ae1f1b3407c5f"
            },
            {
              "fixed": "0b30b35f864310bee8485c952d1877e82e2b9b1a"
            },
            {
              "fixed": "a86160ee79e4600bf77f89eb2dc84782acdeab6f"
            }
          ],
          "repo": "https://github.com/withastro/astro",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-8mv7-9c27-98vc"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-352"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73423.json"
  },
  "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.",
  "id": "CVE-2026-73423",
  "modified": "2026-08-15T11:31:25.150763373Z",
  "published": "2026-08-12T20:35:32.181Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/withastro/astro/releases/tag/astro@7.0.6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73423.json"
    },
    {
      "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"
    },
    {
      "type": "FIX",
      "url": "https://github.com/withastro/astro/commit/0b30b35f864310bee8485c952d1877e82e2b9b1a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/withastro/astro/pull/17250"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Astro: composable `astro/hono` pipeline bypasses `security.checkOrigin` when `middleware()` is absent or misordered"
}