CVE-2025-66523: Foxit Esign

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

URL parameters are directly embedded into JavaScript code or HTML attributes without proper encoding or sanitization. This allows attackers to inject arbitrary scripts when an authenticated user visits a crafted link. This issue affects na1.foxitesign.foxit.com: before 2026‑01‑16.

Affected products

• Foxit Esign: before 2026-01-16 (fixed in 2026-01-16)

Published 2026-01-20. Last modified 2026-06-17.