CVE-2026-78504: Microsoft Office Word Remote Code Execution Vulnerability
Microsoft Office Word Remote Code Execution Vulnerability
Other sources
Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
— 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 16.0.5569.1000Patch KB5002923 - 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 16.0.14334.20906 - Upgrade
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Fixed in 16.0.20326.20138 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20207
Event History
Frequently Asked Questions
Does an attacker need authentication or user interaction to exploit this issue?
The vector indicates no privileges are required, but user interaction is required. The attack can be conducted over a network.
Which Microsoft Word and Office product releases are listed as affected?
The affected products listed are Microsoft Word 2016; Microsoft 365 Apps for Enterprise; Microsoft Office 2019 for 32-bit editions; Microsoft Office LTSC 2021 for 32-bit and 64-bit editions; Microsoft Office LTSC 2024 for 32-bit and 64-bit editions; and Microsoft Office LTSC for Mac 2024.
What level of impact is indicated if exploitation succeeds?
The severity vector rates confidentiality, integrity, and availability impacts as high. Successful exploitation allows code execution.