Detections
Analytics

Microsoft Office Online Server (April 2026)

high Nessus Plugin ID 306432

Synopsis

The Microsoft Office Online Server or Office Web Apps installation on the remote host is affected by multiple vulnerabilities.

Description

The Microsoft Office Online Server or Office Web Apps installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

 - Remote Code Execution vulnerabilities (CVE-2026-32189, CVE-2026-32197, CVE-2026-32198, CVE-2026-32199)

 - Information Disclosure vulnerability in Microsoft Excel 2016 (64-bit edition) (CVE-2026-32188)

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

Solution

Apply Security Update 5002855

See Also

https://support.microsoft.com/help/5002855

Plugin Details

Severity: High

ID: 306432

File Name: smb_nt_ms26_apr_office_web.nasl

Version: 1.1

Type: Local

Agent: windows

Published: 4/14/2026

Updated: 4/14/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

CVSS v2

Risk Factor: Medium

Base Score: 6.8

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

CVSS Score Source: CVE-2026-32189

CVSS v3

Risk Factor: High

Base Score: 7.8

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

Vulnerability Information

CPE: cpe:/a:microsoft:office_online_server, cpe:/a:microsoft:office_web_apps

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Patch Publication Date: 4/14/2026

Vulnerability Publication Date: 4/14/2026

Reference Information

CVE: CVE-2026-32188, CVE-2026-32189, CVE-2026-32197, CVE-2026-32198, CVE-2026-32199

MSFT: MS26-5002855

MSKB: 5002855