CVE-2026-26164

high Microsoft
CVSS v3 Base Score
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS Score
0.1%
Exploitation probability in 30 days
Top 77% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
None
Availability
None
Published: May 7, 2026 (6 days ago)
Last Modified: May 8, 2026
Vendor: Microsoft
Source: NVD

Description

Improper neutralization of special elements in output used by a downstream component ('injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

CWE

CWE-74

Affected Products

microsoft 365 copilot chat

References

🔗 msrc.microsoft.com