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CVE-2025-66458

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Date: December 2, 2025

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.

Severity Score

Related Resources (4)

https://github.com/Lookyloo/lookyloo/security/advisories/GHSA-58h2-652v-gq87
https://nvd.nist.gov/vuln/detail/CVE-2025-66458
https://github.com/Lookyloo/lookyloo/commit/b6ee2fee0afff0b35f37dd891bbce9d53ed8a290
https://www.mend.io/vulnerability-database/CVE-2025-66458

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

Top Fix

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Upgrade Version

Upgrade to version https://github.com/Lookyloo/lookyloo.git - v1.35.3

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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