CVE-2026-21520

Copilot Studio Information Disclosure Vulnerability

CVSS 7.5 HIGHEPSS 1.4%CWE-77

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.5EPSS 1.4%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

22 Jan 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C/CR:H/IR:L/AR:L

Affected products

Microsoft · Microsoft Copilot Studio

References

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