CVE-2025-64765 Astro middleware authentication checks based on url.pathname can be bypassed via url encoded values
Attackers can bypass middleware authentication checks in Astro by using URL-encoded paths, allowing unauthorized access to protected routes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-64765?
CVE-2025-64765 is a medium-severity authentication bypass vulnerability in withastro astro, published on 19 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Astro is a web framework. Prior to version 5.15.8, a mismatch exists between how Astro normalizes request paths for routing/rendering and how the application’s middleware reads the path for validation checks. Astro internally applies decodeURI() to determine which route to render, while the middleware uses context.url.pathname without applying the same normalization (decodeURI). This discrepancy may allow attackers to reach protected routes using encoded path variants that pass routing but bypass validation checks. This issue has been patched in version 5.15.8.
Weakness: CWE-22
Which versions are affected by CVE-2025-64765?
2 open source packages ship an affected version, including astro. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
astro npm | All versions | 5.15.8 |
astro npm | All versions | 5.15.8 |
Products include Astro Astro.
How do I fix CVE-2025-64765?
Upgrade astro to 5.15.8 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-64765 being exploited?
There is no known exploitation of CVE-2025-64765 in the wild and no public exploit code.
Other vulnerabilities in withastro astro
- CVE-2024-56159 Server source code is exposed to the public if sourcemaps are enabled
- CVE-2026-54299 Astro: Host header SSRF in prerendered error page fetch
- CVE-2025-59837 astro allows bypass of image proxy domain validation leading to SSRF and potential XSS
- CVE-2026-50146 Astro: Reflected XSS via unescaped slot name
- CVE-2025-64764 Astro is vulnerable to Reflected XSS via the server islands feature
Sources
Also known as GHSA-ggxq-hp9w-j794.