Out-of-bounds read in Microsoft Office for macOS and Microsoft Office - CVE-2026-56193
Published: July 17, 2026
Vulnerability identifier: #VU138183
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-56193
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Microsoft Office for macOS
Microsoft Office
Microsoft Office for macOS
Microsoft Office
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to out-of-bounds read in Microsoft Office for macOS when parsing a crafted Office file. A remote attacker can send a specially crafted Office file to disclose sensitive information.
User interaction is required to open or preview the crafted file, and the Preview Pane can be used as an attack vector. The disclosed information is limited to memory-related information, specifically a heap address returned by the affected service.
How to mitigate CVE-2026-56193
Install security update from vendor's website.