Out-of-bounds read in Microsoft Office for macOS and Microsoft Word - CVE-2026-63530
Published: August 12, 2026
Vulnerability identifier: #VU141939
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63530
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to out-of-bounds read in Microsoft Office Word when parsing a specially crafted Office file. A remote attacker can send a specially crafted Office file to disclose sensitive information.
User interaction is required to open the crafted file, and the Preview Pane is not an attack vector.
Affected software
Microsoft Office for macOS
Microsoft Word
Microsoft Word
How to mitigate CVE-2026-63530
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.112.26081010
Microsoft Word - update to 16.0.5565.1000
Microsoft Word - update to 16.0.5565.1000