CVE-2026-78519: Microsoft Office Outlook Remote Code Execution Vulnerability
Microsoft Office Outlook Remote Code Execution Vulnerability
Other sources
Use of uninitialized resource in Microsoft Office Outlook 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 16.0.17932.20960 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.14334.20896 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.20326.20136 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5569.1000Patch KB5002919 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20204
Event History
Frequently Asked Questions
Does exploitation require an authenticated account or a user action?
No privileges are required by the attacker, but user interaction is required. The vulnerability is remotely exploitable over a network with low attack complexity.
What is the potential impact if exploitation succeeds?
Successful exploitation can allow code execution and has high potential impact on confidentiality, integrity, and availability.
Which Outlook and Office product families are listed as affected?
The affected software list includes Microsoft 365 Apps for Enterprise, Outlook 2016, Microsoft Office Outlook, Office 2019 for 64-bit editions, and Office LTSC 2021 and 2024 for both 32-bit and 64-bit editions.