CVE-2026-91814
A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF documents. Changes to visible document content may not invalidate the existing signature, allowing attackers to alter signed content and potentially carry out content spoofing while the document continues to appear validly signed.
- Published Sep 23, 2026
- CVSS 5.3 medium
- 0.1% chance of exploitation in the next 30 days (EPSS)