CVE-2025-66459: Lookyloo

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Lookyloo is a web interface that allows users to capture a website page and then display a tree of domains that call each other. Prior to 1.35.3, a XSS vulnerability can be triggered when a user submits a list of URLs to capture, one of them contains a HTML element, and the capture fails. Then, the error field is populated with an error message that contains the bad URL they tried to capture, triggering the XSS. This vulnerability is fixed in 1.35.3.

Affected products

• Lookyloo Lookyloo: before 1.35.3 (fixed in 1.35.3)

Published 2025-12-02. Last modified 2026-09-25.