CVE-2025-42620

Technical Description

In affected versions, vulnerability-lookup handled user-controlled

content in comments and bundles in an unsafe way, which could lead to

stored Cross-Site Scripting (XSS).

On the backend, the related_vulnerabilities field of bundles accepted

arbitrary strings without format validation or proper sanitization. On

the frontend, comment and bundle descriptions were converted from

Markdown to HTML and then injected directly into the DOM using string

templates and innerHTML. This combination allowed an attacker who could

create or edit comments or bundles to store crafted HTML/JavaScript

payloads which would later be rendered and executed in the browser of

any user visiting the affected profile page (user.html). 

This issue affects Vulnerability-Lookup: before 2.18.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References