Out-of-bounds read in Microsoft products - CVE-2026-55045
Published: July 17, 2026
Vulnerability identifier: #VU138208
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55045
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to out-of-bounds read in Microsoft Office for macOS when processing crafted content locally. A remote attacker can cause the application to process a specially crafted file or preview crafted content to execute arbitrary code.
The Preview Pane is an attack vector.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft SharePoint Server
Microsoft Office
Microsoft SharePoint Server
How to mitigate CVE-2026-55045
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.111.26071215
Microsoft Office - update to 16.0.5561.1000
Microsoft SharePoint Server - addressed in versions 16.0.5561.1001, 16.0.10417.20175, 16.0.19725.20434
Microsoft Office - update to 16.0.5561.1000
Microsoft SharePoint Server - addressed in versions 16.0.5561.1001, 16.0.10417.20175, 16.0.19725.20434