CVE-2026-73424Public exploitNetwork attack vectorHinoki check available

Protected-route reads via unauthenticated ISR rewrite

Published Aug 17, 2026 · Updated Aug 18, 2026

Authorization bypass in the Astro Vercel adapter before 11.0.3 allows remote attackers to read protected GET routes via /_isr. In packages/integrations/vercel/src/serverless/entrypoint.ts, the public ISR branch rewrites url.pathname from the x_astro_path query parameter when x-vercel-isr equals 1, but performs no per-build secret check before constructing the new Request. Exposure requires @astrojs/vercel with ISR enabled and edge-only path rules or split edge middleware; published impact is bounded to fresh rendering of otherwise protected GET routes.

CVSS severity6.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authorization bypass in the Astro Vercel adapter before 11.0.3 allows remote attackers to read protected GET routes via /_isr. In packages/integrations/vercel/src/serverless/entrypoint.ts, the public ISR branch rewrites url.pathname from the x_astro_path query parameter when x-vercel-isr equals 1, but performs no per-build secret check before constructing the new Request. Exposure requires @astrojs/vercel with ISR enabled and edge-only path rules or split edge middleware; published impact is bounded to fresh rendering of otherwise protected GET routes.

The record

CVE
CVE-2026-73424
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
Astro Technology Company
Product
Astro
Classifications
CWE-441, CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 10.0.3, < 11.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Astro Technology Company · Astroversion=>= 10.0.3, < 11.0.3

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-441Unintended Proxy or Intermediary ('Confused Deputy')
CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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