---
cve: "CVE-2026-73423"
severity: "MEDIUM"
cvss: 5.1
epss: "18%"
vendor: "withastro"
kev: false
exploited: false
published: "2026-08-12 21:17:41"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-15T23:31:40+02:00"
---

# CVE-2026-73423

> 5.1 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 0b30b35f864310bee8485c952d1877e82e2b9b1a (Commit)
- a86160ee79e4600bf77f89eb2dc84782acdeab6f (Commit)

## Referenzen

- <https://github.com/withastro/astro/security/advisories/GHSA-8mv7-9c27-98vc>
- <https://github.com/withastro/astro/pull/17250>
- <https://github.com/withastro/astro/commit/0b30b35f864310bee8485c952d1877e82e2b9b1a>
- <https://github.com/withastro/astro/releases/tag/astro@7.0.6>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73423) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_