Adobe InCopy < 20.5.1 / 21.0 < 21.1.0 Arbitrary code execution (APSB26-04)

high Nessus Plugin ID 283677

Synopsis

The Adobe InCopy instance installed on the remote host is affected by a vulnerability.

Description

The version of Adobe InCopy installed on the remote host is prior to 20.5.1, 21.1.0. It is, therefore, affected by a vulnerability as referenced in the APSB26-04 advisory.

- InCopy versions 21.0, 19.5.5 and earlier are affected by a Heap-based Buffer Overflow vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file. (CVE-2026-21281)

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

Solution

Upgrade to Adobe InCopy version 20.5.1, 21.1.0 or later.

Plugin Details

Severity: High

ID: 283677

File Name: adobe_incopy_apsb26-04.nasl

Version: 1.1

Type: local

Agent: windows, macosx, unix

Family: Misc.

Published: 1/14/2026

Updated: 1/14/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-21281

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

Vulnerability Information

CPE: cpe:/a:adobe:incopy

Required KB Items: installed_sw/Adobe InCopy

Exploit Ease: No known exploits are available

Patch Publication Date: 1/13/2026

Vulnerability Publication Date: 1/13/2026

Reference Information

CVE: CVE-2026-21281

CWE: 122

Detections

Analytics