CVE-2026-21521
High
Description
Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.
SeverityHigh
CVSS7.4
Exploit probability—
Product
Microsoft 365 Word Copilot
PublishedJan 22, 2026
First seenJan 22, 2026
Weakness typeCWE-150CWE-150
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft 365_word_copilot | No range specified | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.