Detections
Analytics
Security Updates for Microsoft Office Online Server (January 2026)
high Nessus Plugin ID 283462
Language:
Synopsis
The Microsoft Office Online Server installation on the remote host is affected by multiple vulnerabilities.Description
The Microsoft Office Online Server installation on the remote host is missing security updates. It is, therefore, affected by the following vulnerabilities:- Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
(CVE-2026-20950)
- Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-20955)
- Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-20957)
Solution
Microsoft has released 5002824 to address this issue.See Also
Plugin Details
Severity: High
ID: 283462
File Name: smb_nt_ms26_jan_office_web.nasl
Version: 1.4
Type: local
Agent: windows
Family: Windows : Microsoft Bulletins
Published: 1/13/2026
Updated: 2/24/2026
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-2026-20957
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:microsoft:office_online_server, cpe:/a:microsoft:office_web_apps
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