Out-of-bounds read in Microsoft products - CVE-2026-97755
Published: October 14, 2026
Vulnerability identifier: #VU155578
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-2026-97755
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 an out-of-bounds read in Microsoft Office Excel when processing malicious Office files. A remote attacker can send a malicious Office file and convince a user to open it to execute arbitrary code.
The Preview Pane is not an attack vector.
Affected software
Office Online Server
Microsoft Office
Microsoft SharePoint Server
Microsoft Office
Microsoft SharePoint Server
How to mitigate CVE-2026-97755
Install security update from vendor's website.
Office Online Server - update to 16.0.10417.20228
Microsoft Office - addressed in versions 16.0.14334.20974, 16.0.17932.21056
Microsoft SharePoint Server - update to 16.0.20326.20190
Microsoft Office - addressed in versions 16.0.14334.20974, 16.0.17932.21056
Microsoft SharePoint Server - update to 16.0.20326.20190