CVE-2025-66520: Foxit PDF Editor Cloud

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A stored cross-site scripting (XSS) vulnerability exists in the Portfolio feature of the Foxit PDF Editor cloud (pdfonline.foxit.com). User-supplied SVG files are not properly sanitized or validated before being inserted into the HTML structure. As a result, embedded HTML or JavaScript within a crafted SVG may execute whenever the Portfolio file list is rendered.

Affected products

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

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