CVE-2025-66459

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, 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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-12-02

Last Modified

2025-12-05

Generated

2026-07-06

AI Q&A

2025-12-02

EPSS Evaluated

2026-07-05

NVD

CVE-2025-66459

EUVD

EUVD-2025-200304

Affected Vendors & Products

Vendor	Product	Version / Range
lookyloo	lookyloo	*

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Executive Summary

This vulnerability is a Cross-Site Scripting (XSS) issue in Lookyloo versions prior to 1.35.3. It occurs when a user submits a list of URLs to capture, and one of the URLs contains an HTML element that causes the capture to fail. The error message then includes the problematic URL, which can trigger the XSS vulnerability by injecting malicious code into the error field.

Impact Analysis

The XSS vulnerability can allow an attacker to execute malicious scripts in the context of the user's browser when they view the error message. This can lead to unauthorized actions, data theft, or session hijacking, depending on how the application and user interact with the malicious script.

Mitigation Strategies

Upgrade Lookyloo to version 1.35.3 or later, as this version contains the fix for the XSS vulnerability.

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