URL Redirection to Untrusted Site ('Open Redirect')

Summary

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 versions prior to 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.