CVE-2026-21520: high-severity vulnerability in Microsoft Copilot Studio
Copilot Studio Information Disclosure Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 1.5%
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 StudioRelated CVEs — Microsoft Copilot Studio
In the same product, most dangerous first.
CVE-2024-38206HIGHMicrosoft Copilot Studio Information Disclosure VulnerabilityEPSS 12.3%CVE-2024-43610HIGHCopilot Studio Information Disclosure VulnerabilityEPSS 1.0%CVE-2024-49038CRITICALMicrosoft Copilot Studio Elevation Of Privilege VulnerabilityEPSS 1.0%CVE-2026-80098CRITICALCopilot Studio Elevation of Privilege VulnerabilityEPSS 0.5%