Medium severity · published Aug 17, 2026
CVE-2026-73424
Astro: Unauthenticated path override in the @astrojs/vercel ISR function
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
astro · withastro
>= 10.0.3, < 11.0.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73424
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73424
github.com
https://github.com/withastro/astro/commit/3a43cf0f3690a8e33cb30109bc5165611cf38fcd
github.com
https://github.com/withastro/astro/pull/17370
github.com
https://github.com/withastro/astro/releases/tag/@astrojs/vercel@11.0.3
github.com
https://github.com/withastro/astro/security/advisories/GHSA-x27w-589x-frm2
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