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CVE-2026-73423— Astro: composable `astro/hono` pipeline bypasses `security.checkOrigin` when `middleware()` is absent or misordered

Quick assessment

Affected
withastro astro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Astro Astro是Astro组织开源的一个内容驱动网站的 web 框架。 Astro 7.0.0版本至7.0.6之前版本存在跨站请求伪造漏洞，该漏洞源于可组合的astro/hono管线仅通过middleware()安装来源检查，而actions()和pages()可独立调度用户代码，导致跨域表单请求在来源检查前执行，可能受到跨站请求伪造攻击。

CVSS 5.1 · Medium EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
withastro astro >= 7.0.0, < 7.0.6 affected
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I. Basic Information for CVE-2026-73423

Vulnerability Information
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Vulnerability Title
Astro: composable `astro/hono` pipeline bypasses `security.checkOrigin` when `middleware()` is absent or misordered
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Astro 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Astro Astro是Astro组织开源的一个内容驱动网站的 web 框架。 Astro 7.0.0版本至7.0.6之前版本存在跨站请求伪造漏洞，该漏洞源于可组合的astro/hono管线仅通过middleware()安装来源检查，而actions()和pages()可独立调度用户代码，导致跨域表单请求在来源检查前执行，可能受到跨站请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
withastro astro >= 7.0.0, < 7.0.6 -

II. Public POCs for CVE-2026-73423

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III. Intelligence Information for CVE-2026-73423

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Patches & Fixes for CVE-2026-73423 (2)

Vendor Advisories for CVE-2026-73423 (1)

Vendor Pages for CVE-2026-73423 (1)

Same Patch Batch · withastro · 2026-08-12 · 3 CVEs total

CVE-2026-73422 5.3 MEDIUM Astro: Reflected XSS via unescaped View Transition animation properties
CVE-2026-73425 3.7 LOW @astrojs/netlify generates an overly-broad Netlify Image CDN allowlist because remotePatte

IV. Related Vulnerabilities

Same product: astro
Same vendor: withastro
Same weakness: CWE-352

V. Comments for CVE-2026-73423

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