Out-of-bounds read in Microsoft products - CVE-2026-45455
Published: June 10, 2026
Vulnerability identifier: #VU134211
CSH Severity: Medium
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-45455
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in Microsoft Excel. A remote attacker can create a specially crafted Office file, trick the victim into opening it, trigger an out-of-bounds read error and read contents of memory on the system.
Affected software
Office Online Server
Microsoft 365 Apps for Enterprise
Microsoft Office
Microsoft Excel
Microsoft Office LTSC
Microsoft 365 Apps for Enterprise
Microsoft Office
Microsoft Excel
Microsoft Office LTSC
How to mitigate CVE-2026-45455
Install updates from vendor's website.