---
id: CVE-2025-66458
title: >-
  Lookyloo is a web interface that allows users to capture a website page and
  then display a tree of domains that call each other
summary: >-
  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 malic…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: lookyloo
product: lookyloo
affected:
  - lookyloo < 1.35.3
patched:
  - lookyloo 1.35.3
published: '2025-12-02'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T23:10:00.463'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66458'
references:
  - url: >-
      https://github.com/Lookyloo/lookyloo/commit/b6ee2fee0afff0b35f37dd891bbce9d53ed8a290
    label: security-advisories@github.com
  - url: >-
      https://github.com/Lookyloo/lookyloo/security/advisories/GHSA-58h2-652v-gq87
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00188
epssPercentile: 0.07521
ingestedAt: '2026-09-25T23:21:16.865Z'
---

## Overview

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.

## Affected

- `lookyloo < 1.35.3`

## Remediation

Upgrade past the affected range:

- `lookyloo 1.35.3`