5.5

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2025-54793

CVE-2025-54793: Astro: Duplicate trailing slash feature can lead to Open Redirects

Astro is a web framework for content-driven websites. In versions 5.2.0 through 5.12.7, there is an Open Redirect vulnerability in the trailing slash redirection logic when handling paths with double slashes. This allows an attacker to redirect users to arbitrary external domains by crafting URLs such as https://mydomain.com//malicious-site.com/. This increases the risk of phishing and other social engineering attacks. This affects sites that use on-demand rendering (SSR) with the Node or Cloudflare adapters. It does not affect static sites, or sites deployed to Netlify or Vercel. This issue is fixed in version 5.12.8. To work around this issue at the network level, block outgoing redirect responses with a Location header value that starts with //.

(GitHub Advisory)

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CVE-2025-54793

CVE-2025-54793:

5.5

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation pocAutomatable YesTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
astro	npm	>= 5.2.0, < 5.12.8	5.12.8

Technical Details

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Root Cause Analysis

The vulnerability is an open redirection issue in Astro's server-side rendering (SSR) mode, caused by improper handling of URL paths that start with a double slash (//). The provided patch addresses this by modifying the isInternalPath helper function to correctly identify such paths as internal, thus preventing the vulnerable redirection logic from being executed.

The key piece of evidence for identifying the vulnerable function comes from the test file, packages/astro/test/ssr-trailing-slash.test.js. The tests in this file repeatedly call app.render(request) to simulate requests with malicious paths and verify that the redirection no longer occurs. This strongly indicates that the render function is the entry point for the request handling logic that contains the flaw.

The render function orchestrates the process of taking an incoming request and producing a response. A part of this process involves normalizing the URL by adding or removing trailing slashes, which is where the vulnerability existed. By failing to properly validate the path, the render function could be tricked into generating a redirect to an arbitrary external website.

Therefore, the render function is the primary vulnerable function. During an exploit, this function would be present in any runtime profile or stack trace, as it is central to the processing of the malicious request and the generation of the harmful redirect.

Vulnerable functions

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WAF Rule

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Reasoning

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