CVE-2026-69477: Microsoft Office Access Remote Code Execution Vulnerability

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-08 · updated 2026-10-31
Weakness: CWE-122

Description

Heap-based buffer overflow in Microsoft Office Access allows an authorized attacker to execute code locally.

Affected products

Microsoft 365 Apps: all versions
Microsoft Access: 2016
Microsoft Office 2019: all versions
Microsoft Office 2021: all versions
Microsoft Office LTSC 2024: all versions
Microsoft 365 Apps: from 16.0.1 before 16.0.20326.20138 — fixed in 16.0.20326.20138
Microsoft Access 2016: from 16.0.0 before 16.0.5569.1000 — fixed in 16.0.5569.1000
Microsoft Access 2016 (32-bit edition): from 16.0.0 before 16.0.5569.1000 — fixed in 16.0.5569.1000
Microsoft Office LTSC 2021: from 16.0.1 before 16.0.14334.20906 — fixed in 16.0.14334.20906
Microsoft Office: from 19.0.0 before 16.0.10417.20207 — fixed in 16.0.10417.20207
Microsoft Office LTSC 2024: from 16.0.0 before 16.0.17932.20976 — fixed in 16.0.17932.20976

How to fix

Upgrade to a fixed version: Microsoft 365 Apps 16.0.20326.20138; Microsoft Access 2016 16.0.5569.1000; Microsoft Access 2016 (32-bit edition) 16.0.5569.1000; Microsoft Office LTSC 2021 16.0.14334.20906; Microsoft Office 16.0.10417.20207; Microsoft Office LTSC 2024 16.0.17932.20976. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69477

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