CVE-2026-21531: Microsoft Azure Conversation Authoring Client Library

Critical severity, CVSS 9.8. EPSS: 2.6% chance of exploitation in the next 30 days.

Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.

Affected products

Published 2026-02-10. Last modified 2026-06-17.