CVE-2026-78506: Microsoft Office Word Information Disclosure Vulnerability
Improper null termination in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Other sources
Microsoft Office Word Information Disclosure 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 16.0.17932.20976 - Upgrade
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Fixed in 16.0.14334.20906 - Upgrade
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Fixed in 16.113.26091433 - Upgrade
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Fixed in 16.0.5569.1000Patch KB5002923 - Upgrade
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Fixed in 16.0.20326.20138 - Upgrade
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Fixed in 16.0.10417.20207
Event History
Frequently Asked Questions
Which Word deployments are identified as affected?
The listed affected products are Word 2016, Microsoft 365 Apps for Enterprise, Office 365 for Mac, Office LTSC 2021 for 32-bit and 64-bit editions and for Mac, and Office LTSC 2024 for 32-bit and 64-bit editions.
What access and user interaction does exploitation require?
The vector is local and no privileges are required. User interaction is required, but the available data does not specify what action the user must take.
What is the expected security impact?
Successful exploitation can disclose information. The supplied severity vector indicates high confidentiality impact, with no integrity or availability impact.