What’s Vulnerable › Vulnerabilities

CVE-2026-21520: Copilot Studio Information Disclosure Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-22 · updated 2026-07-30
• Weakness: CWE-77

Description

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

Affected products

• Microsoft Copilot Studio: all versions
• Microsoft Copilot Studio: all versions

References

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

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