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OpenAdvisories
Medium · 5.3 CVE-2025-66458 EUVD-2025-200306

Lookyloo has multiple XSS due to unsafe use of f-strings in Markup

Published Dec 2, 2025 · Updated Dec 2, 2025 · Assigned by GitHub_M

Description

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, there are multiple XSS due to unsafe use of f-strings in Markup. The issue requires a malicious 3rd party server responding with a JSON document containing JS code in a script element. This vulnerability is fixed in 1.35.3.

Affected products

VendorProductAffectedFixed
Lookyloo lookyloo < 1.35.3 —

References