Foxit PDF Reader activeDocs Missing Authorization Information Disclosure Vulnerability

September 23rd, 2026
ZDI-26-720 ZDI-CAN-30962

CVE ID

CVE-2026-91788

CVSS Score

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

Affected Vendors

Foxit

Affected Products

PDF Reader

Vulnerability Details

This vulnerability allows remote attackers to disclose sensitive information 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 implementation of the JavaScript API. The issue results from the lack of authorization prior to allowing access to functionality. An attacker can leverage this vulnerability to disclose the contents of other open documents 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

  • 2026-06-15 - Vulnerability reported to vendor
  • 2026-09-23 - Coordinated public release of advisory
  • 2026-09-23 - Advisory Updated

Credit

kai63001

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