Read the docs
TI-2025-40891 Aliases CVE-2025-66459

Lookyloo vulnerable to XSS due to unescaped error message passed to innerHTML

Priority LOW 24CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00331 26th percentileScored 2026-11-07
Fix Fixed lookyloo (Lookyloo): 1.35.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Lookyloolookyloobefore 1.35.31.35.3Patch availableCNA
  • lookyloo VendorLookyloo Affected before 1.35.3 Fixed in 1.35.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:lookyloo:lookyloo:*:*:*:*:*:*:*:*before 1.35.3VulnerableLookyloo
  • cpe:2.3:a:lookyloo:lookyloo:*:*:*:*:*:*:*:* Versions before 1.35.3 Vulnerable ·Lookyloo

Remediation

  • Fix · CNA lookyloo (Lookyloo) Fixed in 1.35.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-66459

References

Patch 4

  • TI-2025-40892 Lookyloo vulnerable to XSS due to lack of escaping in HTML elements passed to Datatables CVSS 4.0MEDIUM 5.3
  • TI-2025-40890 Lookyloo has multiple XSS due to unsafe use of f-strings in Markup CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences