CVE-2026-21520

HIGH

Microsoft Copilot Studio - Unauthenticated Exposure of Sensitive Information

Title source: llm
STIX 2.1

Description

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

References (1)

Core 1
Core References

Scores

CVSS v3 7.5
EPSS 0.0013
EPSS Percentile 31.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-77
Status published
Products (2)
microsoft/copilot_studio
Microsoft/Microsoft Copilot Studio -
Published Jan 22, 2026
Tracked Since Feb 18, 2026