CVE-2025-66458
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-02

Last updated on: 2025-12-05

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2025-12-02
Last Modified
2025-12-05
Generated
2026-06-16
AI Q&A
2025-12-02
EPSS Evaluated
2026-06-15
NVD
CVE-2025-66458
EUVD
EUVD-2025-200306
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
lookyloo lookyloo *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability in Lookyloo versions prior to 1.35.3 involves multiple Cross-Site Scripting (XSS) issues caused by unsafe use of f-strings in Markup. It requires a malicious third-party server to respond with a JSON document containing JavaScript code inside a script element, which can then be executed in the Lookyloo web interface.

Impact Analysis

The vulnerability can allow an attacker to execute arbitrary JavaScript code in the context of the Lookyloo web interface, potentially leading to unauthorized actions, data theft, or session hijacking for users interacting with the affected versions.

Mitigation Strategies

Upgrade Lookyloo to version 1.35.3 or later, as this version contains the fix for the multiple XSS vulnerabilities caused by unsafe use of f-strings in Markup.

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