CVE-2026-21521

high Microsoft
CVSS v3 Base Score
7.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
EPSS Score
0.1%
Exploitation probability in 30 days
Top 80% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Published: January 22, 2026 (112 days ago)
Last Modified: February 2, 2026
Vendor: Microsoft

Description

Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.

CWE

CWE-150

Affected Products

microsoft 365 word copilot

References

🔗 msrc.microsoft.com