CVE-2025-66458 MEDIUM

CVE-2025-66458: Lookyloo has multiple XSS due to unsafe use of f-strings in Markup

Vendor Lookyloo
Product lookyloo
Weakness CWE-79 · XSS
Published December 2, 2025
Last update December 2, 2025
View on NVD All CVEs

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 2, 2025 CVE published
December 2, 2025 Record updated