Detections
Analytics
Security Updates for Microsoft Office Online Server (November 2026)
high Nessus Plugin ID 378498
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:- Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network. (CVE-2026-116927, CVE-2026-118294, CVE-2026-118297, CVE-2026-118298, CVE-2026-118299, CVE-2026-118302, CVE-2026-118701, CVE-2026-118705, CVE-2026-118707, CVE-2026-118709, CVE-2026-118714, CVE-2026-118718, CVE-2026-118721, CVE-2026-118722, CVE-2026-118726, CVE-2026-119986, CVE-2026-120785, CVE-2026-120786, CVE-2026-120788, CVE-2026-120789, CVE-2026-120790, CVE-2026-120791, CVE-2026-124170, CVE-2026-124174, CVE-2026-124176)
- Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network. (CVE-2026-118292, CVE-2026-118295, CVE-2026-118700, CVE-2026-118704, CVE-2026-118711, CVE-2026-118717, CVE-2026-118720, CVE-2026-118731)
- Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a network. (CVE-2026-118293)
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 5002946See Also
Plugin Details
Severity: High
ID: 378498
File Name: smb_nt_ms26_nov_office_web.nasl
Version: 1.1
Type: Local
Agent: windows
Family: Windows : Microsoft Bulletins
Published: 11/10/2026
Updated: 11/10/2026
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.9
Percentile: 58.48
CVSS v2
Risk Factor: Critical
Base Score: 10
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-116927
CVSS v3
Risk Factor: High
Base Score: 8.8
Vector: CVSS:3.0/AV:N/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: 11/10/2026
Vulnerability Publication Date: 11/10/2026
Reference Information
CVE: CVE-2026-116927, CVE-2026-118292, CVE-2026-118293, CVE-2026-118294, CVE-2026-118295, CVE-2026-118296, CVE-2026-118297, CVE-2026-118298, CVE-2026-118299, CVE-2026-118300, CVE-2026-118301, CVE-2026-118302, CVE-2026-118700, CVE-2026-118701, CVE-2026-118703, CVE-2026-118704, CVE-2026-118705, CVE-2026-118706, CVE-2026-118707, CVE-2026-118708, CVE-2026-118709, CVE-2026-118710, CVE-2026-118711, CVE-2026-118712, CVE-2026-118713, CVE-2026-118714, CVE-2026-118715, CVE-2026-118716, CVE-2026-118717, CVE-2026-118718, CVE-2026-118719, CVE-2026-118720, CVE-2026-118721, CVE-2026-118722, CVE-2026-118723, CVE-2026-118724, CVE-2026-118725, CVE-2026-118726, CVE-2026-118727, CVE-2026-118728, CVE-2026-118729, CVE-2026-118730, CVE-2026-118731, CVE-2026-118732, CVE-2026-119986, CVE-2026-120785, CVE-2026-120786, CVE-2026-120788, CVE-2026-120789, CVE-2026-120790, CVE-2026-120791, CVE-2026-124170, CVE-2026-124174, CVE-2026-124176, CVE-2026-124178, CVE-2026-124179