XSS in Lookyloo
CVE-2025-66459
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Lookyloo — versions < 1.35.3
Weakness classification (CWE)
References
- github.com/Lookyloo/lookyloo/security/advisories/GHSA-hvmh-j2jx-48wg (Patch, Vendor Advisory)
- github.com/Lookyloo/lookyloo/commit/1850a34b8cec52438df3b544295b20cfa35f8ad1 (Patch)
- github.com/Lookyloo/lookyloo/commit/8c3ab96de44c1ce15646d734aa06faf884329116 (Patch)
- github.com/Lookyloo/lookyloo/commit/95cdc00fe37fd89790fa89bb3ee3fefa2da38442 (Patch)
Frequently asked questions
- What is CVE-2025-66459?
- CVE-2025-66459 is a medium-severity vulnerability in Lookyloo, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-12-02.
- How severe is CVE-2025-66459?
- Medium severity. CVSS v3 base score is 6.1 out of 10.