CVE-2026-78505: 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 16.0.14334.20906 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5569.1000Patch KB5002916 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.20976 - Upgrade
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Fixed in 16.112.26083020 - 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 16.0.20326.20138
Event History
Frequently Asked Questions
Which Office products are listed as affected?
The affected software list includes Microsoft Office 2016, Microsoft 365 Apps for Enterprise, Office LTSC 2021 for 32-bit and 64-bit editions, Office LTSC 2024 for 32-bit and 64-bit editions, Office LTSC for Mac 2021, and Office LTSC for Mac 2024.
Does an attacker need credentials or elevated privileges to exploit this issue?
No privileges are required according to the CVSS vector. Exploitation is network-based and has low attack complexity, but it requires user interaction.
What is the expected security impact if exploitation succeeds?
The CVSS vector rates confidentiality, integrity, and availability impact as high. The vulnerability is rated high severity with a CVSS score of 8.8.