CVE-2025-54793 Scanner

Astro SSR is a framework utilized by developers for creating fast and modern web applications. It is known for its support of server-side rendering (SSR) and is employed by web developers to enhance page load speed and optimize SEO. Designed to work with Node.js and Cloudflare adapters, Astro is often chosen for its flexibility and adaptability in building web interfaces. Used globally, Astro helps developers in creating both static and dynamic websites with ease. Its user-friendly approach makes it accessible for developers at all levels, contributing to its widespread adoption. As web applications increasingly rely on SSR, Astro continues to play a significant role in the development community.

Open Redirect vulnerabilities occur when a web application improperly redirects users to a different website based on untrusted or unvalidated input. This type of vulnerability can be exploited by attackers to redirect users to malicious or phishing websites. In Astro, this specific vulnerability arises due to improper handling of paths with double slashes in the trailing slash redirection logic. As a consequence, users can be redirected to arbitrary external domains, creating security risks. Open Redirect vulnerabilities particularly raise concerns related to phishing and social engineering, as attackers can exploit them to trick users into visiting malicious sites under the guise of legitimate ones.

In Astro SSR, the Open Redirect vulnerability is notably due to an oversight in the handling of slashes within URLs, leading to insecure redirect logic. Specifically, paths containing double slashes can bypass the intended domain validation checks. This vulnerability requires on-demand SSR with Node.js or Cloudflare adapters to be effectively exploited. Attackers can craft URLs with specific patterns to trick the server into redirecting users to an outside website. The vulnerable endpoint is linked to the URL parsing mechanism within the SSR process, although the exact parameters depend on the adapters used. This oversight in URL handling emphasizes the importance of meticulous input validation in web applications.

Exploitation of an Open Redirect vulnerability in web applications like Astro SSR can have significant repercussions. Users may be redirected to harmful websites where they risk exposure to phishing, malware downloads, and other security threats. By manipulating redirections, attackers could disguise their malicious intent, leading to successful phishing campaigns. These types of attacks can erode user trust and damage the reputation of the affected organizations. Additionally, misuse of redirection logic might lead to compliance violations, particularly if personal data is improperly handled during redirects. The broader impact underscores the need for prompt vulnerability mitigation to protect users and organizational interests.

REFERENCES

• https://github.com/withastro/astro/security/advisories/GHSA-cq8c-xv66-36gw
• https://nvd.nist.gov/vuln/detail/CVE-2025-54793
• https://github.com/withastro/astro/commit/9ec88a04f93611cc07deff76ef6a18c88d6a77b9