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EUVD-2026-249993

2026-10-10T01:43:28.890455+00:00

EUVD-2026-249993

fkie_cve-2025-55207

2026-10-10T01:43:28.890487+00:00

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.

GHSA-9x9c-ghc5-jhw9 — @astrojs/node's trailing slash handling causes open redirect issue

2026-10-10T01:43:28.890523+00:00

Affected: npm: @astrojs/node

### Summary

Following https://github.com/withastro/astro/security/advisories/GHSA-cq8c-xv66-36gw, there's still an Open Redirect vulnerability in a subset of Astro deployment scenarios.

### Details

Astro 5.12.8 fixed a case 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`.

### Proof of Concept

1. Create a new minimal Astro project (`astro@5.12.8`) 2. Configure it to use the Node adapter (`@astrojs/node@9.4.0`) and force trailing slashes: ```js // astro.config.mjs import { defineConfig } from 'astro/config'; import node from '@astrojs/node'; export default defineConfig({ trailingSlash: 'always', adapter: node({ mode: 'standalone' }), }); ``` 3. Build the site by running `astro build`. 4. Run the server, e.g. with `astro preview`. 5. Append `//astro.build/press` to the preview URL, e.g. 6. The site will redirect to the external Astro Build origin.

#### Example reproduction

1. Open [this StackBlitz reproduction](https://stackblitz.com/edit/github-4fvpfhcz-nyfj2mbf). 2. Open the preview in a separate window so the StackBlitz embed doesn't cause security errors. 3. Append `//astro.build/press` to the preview URL, e.g. `https://x.loca…