CVE-2026-21260
High
Description
Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Microsoft Office
PublishedFeb 10, 2026
First seenFeb 10, 2026
Weakness typeCWE-200Sensitive information exposure
How to fix
Update
- microsoft sharepoint_server16.0.19127.20518 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft office | 2019 | — |
| microsoft 365_apps | No range specified | — |
| microsoft office_long_term_servicing_channel | 2021, 2024 | — |
| microsoft outlook | 2016 | — |
| microsoft sharepoint_server | v < 16.0.19127.20518, 2016, 2019 | 16.0.19127.20518 |
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