Foxit PDF Reader RichMedia Annotation Directory Traversal Remote Code Execution Vulnerability

September 23rd, 2026
ZDI-26-734 ZDI-CAN-31605

CVE ID

CVE-2026-91801

CVSS Score

7.8 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors

Foxit

Affected Products

PDF Reader

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the handling of RichMedia annotations. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of the current user.

Additional Details

Foxit has issued an update to correct this vulnerability. More details can be found at:
https://www.foxit.com/support/security-bulletins.html

Disclosure Timeline

  • 2026-07-17 - Vulnerability reported to vendor
  • 2026-09-23 - Coordinated public release of advisory
  • 2026-09-23 - Advisory Updated

Credit

Liang Zhu

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