Detections
Analytics

Foxit PDF Reader < 2026.1 Multiple Vulnerabilities

high Nessus Plugin ID 304397

Language:

Synopsis

A PDF viewer installed on the remote Windows host is affected by multiple vulnerabilities

Description

According to its version, the Foxit PDF Reader application (previously named Foxit Reader) installed on the remote Windows host is prior to 2026.1. It is, therefore affected by multiple vulnerabilities:

 - The application's list box calculate array logic keeps stale references to page or form objects after they are deleted or re-created, which allows crafted documents to trigger a use-after-free when the calculation runs and can potentially lead to arbitrary code execution. (CVE-2026-3779)

 - The application allows PDF JavaScript and document/print actions (such as WillPrint/DidPrint) to update form fields, annotations, or optional content groups (OCGs) immediately before or after redaction, encryption, or printing. These scriptdriven updates are not fully covered by the existing redaction, encryption, and printing logic, which, under specific document structures and user workflows, may cause a small amount of sensitive content to remain unremoved or unencrypted as expected, or result in printed output that slightly differs from what was reviewed on screen. (CVE-2026-3774)

 - The application's update service, when checking for updates, loads certain system libraries from a search path that includes directories writable by lowprivileged users and is not strictly restricted to trusted system locations. Because these libraries may be resolved and loaded from userwritable locations, a local attacker can place a malicious library there and have it loaded with SYSTEM privileges, resulting in local privilege escalation and arbitrary code execution. (CVE-2026-3775)

 - The application's installer runs with elevated privileges but resolves system executables and DLLs using untrusted search paths that can include user-writable directories, allowing a local attacker to place malicious binaries with the same names and have them loaded or executed instead of the legitimate system files, resulting in local privilege escalation. (CVE-2026-3780)

 - The application does not validate the presence of required appearance (AP) data before accessing stamp annotation resources. When a PDF contains a stamp annotation missing its AP entry, the code continues to dereference the associated object without a prior null or validity check, which allows a crafted document to trigger a null pointer dereference and crash the application, resulting in denial of service.
 (CVE-2026-3776)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Foxit PDF Reader version 2026.1 or later

See Also

http://www.nessus.org/u?a27a3e57

Plugin Details

Severity: High

ID: 304397

File Name: foxit_reader_2026_1.nasl

Version: 1.8

Type: Local

Agent: windows

Family: Windows

Published: 3/31/2026

Updated: 4/20/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

CVSS Score Source: CVE-2026-3774

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-3777

Vulnerability Information

CPE: cpe:/a:foxitsoftware:foxit_reader

Required KB Items: SMB/Registry/Enumerated, installed_sw/Foxit Reader

Exploit Ease: No known exploits are available

Patch Publication Date: 3/31/2026

Vulnerability Publication Date: 3/31/2026

Reference Information

CVE: CVE-2026-3774, CVE-2026-3775, CVE-2026-3776, CVE-2026-3777, CVE-2026-3778, CVE-2026-3779, CVE-2026-3780

IAVA: 2026-A-0289