Heap-based buffer overflow in Microsoft products - CVE-2026-69477
Published: September 8, 2026
Vulnerability identifier: #VU147729
CSH Severity: Medium
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-2026-69477
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in Microsoft Office Access when opening a crafted file. A local user can send a crafted file and convince a user to open it to execute arbitrary code.
The Preview Pane is not an attack vector.
Affected software
Microsoft 365 Apps for Enterprise
Microsoft Access
Microsoft Office
Microsoft Access
Microsoft Office
How to mitigate CVE-2026-69477
Install security update from vendor's website.
Microsoft 365 Apps for Enterprise - update to 16.0.20326.20138
Microsoft Access - update to 16.0.5569.1000
Microsoft Office - addressed in versions 16.0.10417.20207, 16.0.14334.20906, 16.0.17932.20976
Microsoft Access - update to 16.0.5569.1000
Microsoft Office - addressed in versions 16.0.10417.20207, 16.0.14334.20906, 16.0.17932.20976