Vulnerability · Published Dec 2, 2025 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-severity cross-site scripting in lookyloo from Lookyloo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.3%top 73.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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, 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.

Affected products (as reported)

Vendor	Product	Versions
Lookyloo	lookyloo	< 1.35.3

Weakness: CWE-79 · Vector: 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

References

https://github.com/Lookyloo/lookyloo/security/advisories/GHSA-hvmh-j2jx-48wg x_refsource_CONFIRM
https://github.com/Lookyloo/lookyloo/commit/1850a34b8cec52438df3b544295b20cfa35f8ad1 x_refsource_MISC
https://github.com/Lookyloo/lookyloo/commit/8c3ab96de44c1ce15646d734aa06faf884329116 x_refsource_MISC
https://github.com/Lookyloo/lookyloo/commit/95cdc00fe37fd89790fa89bb3ee3fefa2da38442 x_refsource_MISC