Detections
Analytics
Security Updates for Microsoft Office Online Server (July 2026)
high Nessus Plugin ID 326872
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:- Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
(CVE-2026-47642, CVE-2026-54131, CVE-2026-55948)
- Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to disclose information locally. (CVE-2026-48580, CVE-2026-55138)
- Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally. (CVE-2026-50408, CVE-2026-54988, CVE-2026-55046, CVE-2026-55122, CVE-2026-55898)
- Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-50675, CVE-2026-55029, CVE-2026-55037, CVE-2026-55041, CVE-2026-55053, CVE-2026-55131, CVE-2026-55947, CVE-2026-58618)
- Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally. (CVE-2026-50678)
- Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-55024, CVE-2026-55025)
- Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
(CVE-2026-55031, CVE-2026-55044, CVE-2026-55058)
- Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
(CVE-2026-55036)
- Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-55039)
- Integer overflow or wraparound in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-55048)
- Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network. (CVE-2026-55054)
- Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-55136)
- Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-55141, CVE-2026-55899)
- Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-55949)
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 5002884See Also
Plugin Details
Severity: High
ID: 326872
File Name: smb_nt_ms26_jul_office_web.nasl
Version: 1.2
Type: Local
Agent: windows
Family: Windows : Microsoft Bulletins
Published: 7/14/2026
Updated: 7/15/2026
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.9
Percentile: 96.93
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-2026-55949
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
CVSS Score Source: CVE-2026-58618
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: 7/14/2026
Vulnerability Publication Date: 7/14/2026
Reference Information
CVE: CVE-2026-47642, CVE-2026-48580, CVE-2026-50408, CVE-2026-50675, CVE-2026-50678, CVE-2026-54131, CVE-2026-54988, CVE-2026-55024, CVE-2026-55025, CVE-2026-55029, CVE-2026-55031, CVE-2026-55036, CVE-2026-55037, CVE-2026-55039, CVE-2026-55041, CVE-2026-55044, CVE-2026-55046, CVE-2026-55048, CVE-2026-55053, CVE-2026-55054, CVE-2026-55058, CVE-2026-55122, CVE-2026-55131, CVE-2026-55136, CVE-2026-55137, CVE-2026-55138, CVE-2026-55141, CVE-2026-55898, CVE-2026-55899, CVE-2026-55947, CVE-2026-55948, CVE-2026-55949, CVE-2026-58618