Unauthenticated route access via decode-limit rewrite mismatch
Published Jul 8, 2026 · Updated Jul 8, 2026
Authorization bypass in Astro 6.4.7 allows remote attackers to access protected routes via deeply encoded request paths. The iterative pathname decoder returns a partially decoded value after ten passes, while rewrite route matching applies another decodeURI() operation and resolves the protected route. Exploitation requires pathname-based middleware authorization followed by next(context.url) or equivalent rewrite routing, enabling unauthenticated access to guarded pages or APIs.
Summary
What happened
Authorization bypass in Astro 6.4.7 allows remote attackers to access protected routes via deeply encoded request paths. The iterative pathname decoder returns a partially decoded value after ten passes, while rewrite route matching applies another decodeURI() operation and resolves the protected route. Exploitation requires pathname-based middleware authorization followed by next(context.url) or equivalent rewrite routing, enabling unauthenticated access to guarded pages or APIs.
The record
- CVE
- CVE-2026-59731
- Published
- Jul 8, 2026
- Updated
- Jul 8, 2026
- Vendor
- Astro Technology Company
- Product
- Astro
- Classifications
- CWE-647, CAPEC-4, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 8, 2026CVE publishedPublication date reported by the CVE source.
- Jul 8, 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.
- Affected versionversion=>= 6.4.7, < 6.4.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- GHSA-vj59-8hwv-xxmv reproductionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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