Summary
Impact: Tampering. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What privileges does an attacker need to exploit this vulnerability?
An attacker must be an authenticated, registered collaborator and own an input dataset in the affected collaboration.
Vulnerabilities 1
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High 7.7
Azure Confidential Clean Rooms Tampering Vulnerability
Missing authorization in Azure Confidential Clean Rooms allows an authorized attacker to perform tampering over a network.
Revision history
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#1
Information published.
References
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CVE-2026-121668 Azure Confidential Clean Rooms Tampering Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-121668
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss