CVE-2026-77898: Microsoft Office Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code over a network.
Other sources
Microsoft Office Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.20326.20138 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.20976 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20207 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.14334.20906
Event History
Frequently Asked Questions
Does exploitation require prior authentication or user interaction?
No privileges are required, but user interaction is required. The attack vector is network-based.
How difficult is exploitation expected to be?
The vulnerability is rated as requiring high attack complexity, despite being network-reachable and requiring no privileges.
Which Office product editions are identified as affected?
The listed products are Microsoft 365 Apps for Enterprise; Microsoft Office 365 for Mac; Office LTSC for Mac 2021 and 2024; Office LTSC 2021 and 2024 for 64-bit editions; and Office 2019 for 32-bit and 64-bit editions.