- 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.
- Source
- security-advisories@github.com
- NVD status
- Analyzed
- Products
- astro
CVSS 3.1
- Type
- Primary
- Base score
- 6.5
- Impact score
- 2.5
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Severity
- MEDIUM
- security-advisories@github.com
- CWE-647
- Hype score
- Not currently trending
🟠 Astro, Authentication Bypass, #CVE-2025-66202 (Medium) https://t.co/IIjwSe0c6A
@dailycve
11 Dec 2025
10 Impressions
0 Retweets
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CVE-2025-66202 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 ch… https://t.co/eBgJelqw71
@CVEnew
8 Dec 2025
165 Impressions
0 Retweets
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I discovered my first two CVEs while researching the Astro framework (800k+ weekly downloads, 50k+⭐). • CVE-2025-65019: XSS via unsafe data: protocol in image loading • CVE-2025-66202: Path-based middleware auth bypass (bypasses CVE-2025-64765 using dpl URL encoding. https
@zomasec
27 Nov 2025
154 Impressions
0 Retweets
5 Likes
0 Bookmarks
1 Reply
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{
"nodes": [
{
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