CVE-2025-66458

MEDIUM

lookyloo < 1.35.3 - Cross-Site Scripting via Unsafe f-strings in Markup

Title source: llm
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 6.1
EPSS 0.0015
EPSS Percentile 4.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (1)
lookyloo/lookyloo < 1.35.3
Published Dec 02, 2025
Tracked Since Feb 18, 2026