CVE-2025-55207 @astrojs/node's trailing slash handling causes open redirect issue
Attackers can redirect users to malicious sites via crafted links in specific Astro Node adapter configurations, enabling phishing attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-55207?
CVE-2025-55207 is a medium-severity vulnerability in withastro astro, published on 15 Aug 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 for content-driven websites. Following CVE-2025-54793 there's still an Open Redirect vulnerability in a subset of Astro deployment scenarios prior to version 9.4.1. Astro 5.12.8 addressed CVE-2025-54793 where https://example.com//astro.build/press would redirect to the external origin //astro.build/press. However, with the Node deployment adapter in standalone mode and trailingSlash set to "always" in the Astro configuration, https://example.com//astro.build/press still redirects to //astro.build/press. This affects any user who clicks on a specially crafted link pointing to the affected domain. Since the domain appears legitimate, victims may be tricked into trusting the redirected page, leading to possible credential theft, malware distribution, or other phishing-related attacks. This issue has been patched in version 9.4.1.
Weakness: CWE-601
Which versions are affected by CVE-2025-55207?
2 open source packages ship an affected version, including @astrojs/node.
| Package | Affected | Fixed in |
|---|---|---|
@astrojs/node npm | All versions | 9.4.1 |
@astrojs/node npm | All versions | 9.4.1 |
How do I fix CVE-2025-55207?
Upgrade @astrojs/node to 9.4.1 or later.
Is CVE-2025-55207 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55207 exists.
Sources
Also known as GHSA-9x9c-ghc5-jhw9.