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Δ / VULNERABILITY RECORD

CVE-2026-21520.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSHIGH / 7.5No severity score in this snapshot.
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSMicrosoft vendor recordModified Jan 22, 2026

Disclosure summary

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

Source-reported weakness categories

CWE-77

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

Microsoft Security Updates (CVRF) · 2026-Jan

Open original source · Updated Jan 22, 2026

Copilot Studio Information Disclosure Vulnerability

Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.

Microsoft maximum product score: 7.5

VendorProduct / associationVersion / bounds
Microsoft update guideMicrosoft Copilot Studio (MSRC status code 3)

Original records & references

PUBLISHED 2026-01-22T03:00:00-05:00
MODIFIED 2026-01-22T03:00:00-05:00
INGESTED 2026-10-08T12:45:23-04:00