CVE-2025-66458: 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.
CVE-2025-66458 · Severity: medium · CVSS 6.1 · Published 2025-12-02
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.
No. Junglewise Threat Intelligence has no report of CVE-2025-66458 being exploited in the wild.
How severe is CVE-2025-66458?
Medium severity, with a CVSS score of 6.1, published 2 December 2025.
Which products and versions are affected?
Lookyloo. The advisory does not name versions.
Is there a fix for CVE-2025-66458?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-66458?
Check whether you run Lookyloo. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.