CVE-2026-91797: Foxit PDF Editor

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

Foxit PDF Editor/Reader failed to validate the directory traversal path in the attachment file name, resulting in malicious attachments being able to be written to directories outside the expected secure area when the PDF is opened.

Affected products

• Foxit PDF Editor: up to and including 13.2.5.63482; from 14.0.0.33046, up to and including 14.0.7.33751; from 2023.1.0.15510, up to and including 2023.3.0.23028; from 2024.1.0.23997, up to and including 2024.4.1.27687; from 2025.1.0.27937, up to and including 2025.3.0.35737; from 2026.1.0.36452, up to and including 2026.2.0.39747
• Foxit PDF Reader: up to and including 2026.2.0.39747

Published 2026-09-23. Last modified 2026-10-08.