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CVE-2025-66202
Good to know:
Date: December 8, 2025
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.
Severity Score
Related Resources (7)
Severity Score
Weakness Type (CWE)
Use of Non-Canonical URL Paths for Authorization Decisions
CWE-647Top Fix
Upgrade Version
Upgrade to version astro - 5.15.8;https://github.com/withastro/astro.git - astro@5.15.8
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | LOW |
| Integrity (I): | LOW |
| Availability (A): | NONE |