CVE-2026-23768: Naver Lucy-Xss-Filter

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

lucy-xss-filter before commit 7c1de6d allows an attacker to induce server-side HEAD requests to arbitrary URLs when the ObjectSecurityListener or EmbedSecurityListener option is enabled and embed or object tags are used with a src attribute missing a file extension.

Affected products

• Naver Lucy-Xss-Filter: before 2025-06-08 (fixed in 2025-06-08)

Published 2026-01-16. Last modified 2026-06-17.