Detections
Analytics

Security Updates for Microsoft Office Products C2R (January 2026)

high Nessus Plugin ID 283874

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Synopsis

The Microsoft Office Products are affected by multiple vulnerabilities.

Description

The Microsoft Office Products are missing security updates. It is, therefore, affected by multiple vulnerabilities:

 - Remote code execution vulnerabilities that attackers can exploit to bypass authentication and execute unauthorized arbitrary commands. (CVE-2026-20952, CVE-2026-20953)

 - A privilege escalation vulnerability. An attacker can exploit this to gain elevated privileges. (CVE-2026-20943)

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

Solution

Microsoft has released patches to address these issues.

For Office 365, Office 2016 C2R, or Office 2019, 2021 or 2024, ensure automatic updates are enabled or open any office app and manually perform an update.

See Also

http://www.nessus.org/u?5931548c

Plugin Details

Severity: High

ID: 283874

File Name: smb_nt_ms26_jan_office_c2r.nasl

Version: 1.4

Type: local

Agent: windows

Family: Windows

Published: 1/14/2026

Updated: 2/24/2026

Supported Sensors: Frictionless Assessment Agent, 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-2026-20953

CVSS v3

Risk Factor: High

Base Score: 8.4

Temporal Score: 7.3

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

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

Vulnerability Information

CPE: cpe:/a:microsoft:office

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 1/13/2026

Vulnerability Publication Date: 1/13/2026

Reference Information

CVE: CVE-2026-20943, CVE-2026-20952, CVE-2026-20953

IAVA: 2026-A-0044-S