Description
Astro is a web framework. Versions 5.15.7 and below have a double URL encoding bypass which allows any unauthenticated attacker to bypass path-based authentication checks in Astro middleware, granting unauthorized access to protected routes. While the original CVE-2025-64765 was fixed in v5.15.8, the fix is insufficient as it only decodes once. By using double-encoded URLs, attackers can still bypass authentication and access any route protected by middleware pathname checks. This issue is fixed in version 5.15.8.
Problem types
CWE-647: Use of Non-Canonical URL Paths for Authorization Decisions
Product status
References
github.com/.../astro/security/advisories/GHSA-whqg-ppgf-wp8c
github.com/.../astro/security/advisories/GHSA-ggxq-hp9w-j794
github.com/...ommit/6f800813516b07bbe12c666a92937525fddb58ce
