Executive Summary

This vulnerability in Vulnerability-Lookup before version 2.18.0 involves unsafe handling of user-controlled content in comments and bundles. Specifically, the backend accepted arbitrary strings in the related_vulnerabilities field without proper validation or sanitization. On the frontend, comments and bundle descriptions were converted from Markdown to HTML and then injected directly into the DOM using innerHTML. This allowed attackers who could create or edit comments or bundles to store malicious HTML or JavaScript payloads that would execute in the browsers of users visiting the affected profile page, resulting in stored Cross-Site Scripting (XSS).

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Impact Analysis

This vulnerability can impact you by allowing attackers to execute malicious scripts in the browsers of users who visit affected profile pages. This can lead to theft of sensitive information such as cookies or session tokens, unauthorized actions performed on behalf of users, defacement of web content, or distribution of malware. Essentially, it compromises the security and integrity of the web application and the privacy of its users.

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