CVE-2026-21520

HIGH

Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

NETWORK

Complexity

LOW

Privileges

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Published: 1/22/2026Modified: 2/2/2026

Related Intelligence (0)

No articles currently reference this CVE.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21520Vendor Advisory