CVEvulnerability

CVE-2025-66202

6.5 MEDIUM Published 2025-12-09 Modified 2026-10-07 Official page ↗
Status
Analyzed
Published
2025-12-09
Last modified
2026-10-07
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-647

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.

Affected configurations

• astro astro (< 5.15.8)

Related

Weakness · CWE (1)

  • CWE-647 Use of Non-Canonical URL Paths for Authorization Decisions weakness

References