CVE-2026-21520
published 2026-01-22CVE-2026-21520: Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network…
PriorityP351high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
1.40%
69.1th percentile
Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_copilot_studio | — | — |
| msrc | microsoft_copilot_studio | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vendor_msrc7.5HIGH
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Microsoft
Copilot Studio Information Disclosure Vulnerability
vendor_msrc·2026-01-13·CVSS 7.5
CVE-2026-21520 [HIGH] CWE-77 Copilot Studio Information Disclosure Vulnerability
Copilot Studio Information Disclosure Vulnerability
Description: Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector
FAQ: Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?
This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency.
Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.
Copilot Studio: Copilot Studio
Microsoft: Microsoft
Customer Action Required: No
Impact: Information Disclosure
Exploit Status: Publicly Disclosed:No;Exploited:No;
GHSA
GHSA-5vx4-v4r5-wrxg: Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through n
ghsa_unreviewed·2026-01-23
CVE-2026-21520 [HIGH] CWE-77 GHSA-5vx4-v4r5-wrxg: Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through n
Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector
No detection rules found.
No public exploits indexed.
2026-01-22
Published