CVE-2025-66521: Foxit PDF Editor Cloud

Medium severity, CVSS 5.4. EPSS: 0.1% chance of exploitation in the next 30 days.

A stored cross-site scripting (XSS) vulnerability exists in pdfonline.foxit.com within the Trusted Certificates feature. A crafted payload can be injected as the certificate name, which is later rendered into the DOM without proper sanitization. As a result, the injected script executes each time the Trusted Certificates view is loaded.

Affected products

• Foxit PDF Editor Cloud: before 2025-12-01 (fixed in 2025-12-01)

Published 2025-12-19. Last modified 2026-06-17.