CVE-2025-66458

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.

CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
lookyloo	lookyloo	< 1.35.3

References

Advisories & Patches

https://github.com/Lookyloo/lookyloo/commit/b6ee2fee0afff0b35f37dd891bbce9d53ed8a290 https://github.com/Lookyloo/lookyloo/security/advisories/GHSA-58h2-652v-gq87

Frequently Asked Questions

What is 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 1.35.3, 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. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2025-66458? +

CVE-2025-66458 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-66458? +

CVE-2025-66458 affects products from lookyloo, specifically: lookyloo. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66458? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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