Vulnerability · Published Aug 17, 2026 · Assigned by GitHub_M

CVE-2026-73424Astro: Unauthenticated path override in the @astrojs/vercel ISR function

Medium 6.5

In plain English

A medium-severity missing authorization in astro from withastro. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 67.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Astro is a web framework for content-driven websites. From 10.0.3 until 11.0.3, the Astro Vercel adapter in packages/integrations/vercel/src/serverless/entrypoint.ts accepts x_astro_path for the public /_isr function based only on the x-vercel-isr header, allowing unauthenticated GET requests to render routes protected only by Vercel edge path rules or split edge middleware. This issue is fixed in 11.0.3.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@astrojs/vercel	11.0.3	GHSA-x27w-589x-frm2

Affected products (as reported)

Vendor	Product	Versions
withastro	astro	>= 10.0.3, < 11.0.3

Weakness: CWE-441, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References

https://github.com/withastro/astro/security/advisories/GHSA-x27w-589x-frm2 x_refsource_CONFIRM
https://github.com/withastro/astro/pull/17370 x_refsource_MISC
https://github.com/withastro/astro/commit/3a43cf0f3690a8e33cb30109bc5165611cf38fcd x_refsource_MISC
https://github.com/withastro/astro/releases/tag/@astrojs/vercel@11.0.3 x_refsource_MISC