CVE-2026-91809

HIGH CVSS 3.1: 7.8 EPSS 0.12%
Updated Oct 08, 2026
Microsoft
Parameter Value
CVSS 7.8 (HIGH)
Affected Versions 14.0.0.33046 — 2026.2.0.39747
Type CWE-416 (Use After Free)
Vendor Microsoft
Public PoC No

A use-after-free vulnerability exists in Foxit PDF Editor/Reader’s handling of malformed PDF form fields. Improper validation during field-name traversal may cause the application to access a released object, resulting in an application crash.

Attack Parameters

Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 8

Configuration From (including) Up to (excluding)
Foxit Pdf_Editor
cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*
— <= 13.2.5.63482
Foxit Pdf_Editor
cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*
14.0.0.33046 <= 14.0.7.33751
Foxit Pdf_Editor
cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*
2023.1.0.15510 <= 2023.3.0.23028
Foxit Pdf_Editor
cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*
2024.1.0.23997 <= 2024.4.1.27687
Foxit Pdf_Editor
cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*
2025.1.0.27937 <= 2025.3.0.35737
Foxit Pdf_Editor
cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*
2026.1.0.36452 <= 2026.2.0.39747
Foxit Pdf_Reader
cpe:2.3:a:foxit:pdf_reader:*:*:*:*:*:*:*:*
— <= 2026.2.0.39747
Microsoft Windows
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
— —