CVE-2025-42620
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).
Overview
CVE-2025-42620 is a known-severity vulnerability. It was published on December 8, 2025.
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.
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Frequently asked questions
What is CVE-2025-42620?
CVE-2025-42620 is a known-severity vulnerability. It was published on December 8, 2025.
How severe is CVE-2025-42620?
CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.
How do I fix or remediate CVE-2025-42620?
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.
How can CyberStrike help with CVE-2025-42620?
CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-42620 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.