Medium 5.3Published Dec 2, 2025

CVE-2025-66459Lookyloo vulnerable to XSS due to unescaped error message passed to innerHTML

Updated under an hour ago (Oct 26, 2026, 6:50 PM ET)

Does this affect you?

It affects lookyloo. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for lookyloo

Exploited in the last 30 days

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, a XSS vulnerability can be triggered when a user submits a list of URLs to capture, one of them contains a HTML element, and the capture fails. Then, the error field is populated with an error message that contains the bad URL they tried to capture, triggering the XSS. This vulnerability is fixed in 1.35.3.

CVSS: 5.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Dec 2, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Lookyloo lookyloo lookyloo:lookyloo (from the name)	before 1.35.3	CNA record
lookyloo lookyloo lookyloo:lookyloo	before 1.35.3	NVD

References

References

https://github.com/Lookyloo/lookyloo/security/advisories/GHSA-hvmh-j2jx-48wg	x-refsource-confirm, patch, vendor-advisory
https://github.com/Lookyloo/lookyloo/commit/1850a34b8cec52438df3b544295b20cfa35f8ad1	x-refsource-misc, patch
https://github.com/Lookyloo/lookyloo/commit/8c3ab96de44c1ce15646d734aa06faf884329116	x-refsource-misc, patch
https://github.com/Lookyloo/lookyloo/commit/95cdc00fe37fd89790fa89bb3ee3fefa2da38442	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.