CVE-2026-26134
High
Description
Integer overflow or wraparound in Microsoft Office allows an authorized attacker to elevate privileges locally.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Microsoft 365 Copilot
PublishedMar 10, 2026
First seenMar 10, 2026
Weakness typeCWE-190Integer overflowCWE-416Use after free
How to fix
Update
- microsoft 365_copilot16.0.19822.20000 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft 365_copilot | v < 16.0.19822.20000 | 16.0.19822.20000 |
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