Detections
Analytics
Security Updates for Microsoft Office Online Server (June 2026)
high Nessus Plugin ID 320183
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:- Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-44817, CVE-2026-44818, CVE-2026-44820, CVE-2026-44823, CVE-2026-45469)
- Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network. (CVE-2026-44822, CVE-2026-45455)
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 5002875See Also
Plugin Details
Severity: High
ID: 320183
File Name: smb_nt_ms26_jun_office_web.nasl
Version: 1.1
Type: Local
Agent: windows
Family: Windows : Microsoft Bulletins
Published: 6/9/2026
Updated: 6/9/2026
Supported Sensors: Nessus Agent, Nessus
Risk Information
CVSS v2
Risk Factor: High
Base Score: 8.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:P/A:N
CVSS Score Source: CVE-2026-44822
CVSS v3
Risk Factor: High
Base Score: 8.2
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
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: 6/9/2026
Vulnerability Publication Date: 6/9/2026
Reference Information
CVE: CVE-2026-44817, CVE-2026-44818, CVE-2026-44820, CVE-2026-44822, CVE-2026-44823, CVE-2026-45455, CVE-2026-45469