CVE-2026-21531
CRITICAL
GHSA-436v-jg82-p533
9.8
CVSS 3.1
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CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Lifecycle Timeline
3
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
CVE Published
Feb 10, 2026 - 18:16 nvd
CRITICAL 9.8
Description
Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.
Analysis
Deserialization of untrusted data in Azure SDK allows unauthorized code execution over a network. EPSS 0.32%.
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Remediation
Within 24 hours: Identify all applications and systems using Azure Conversation Authoring Client Library up to version 1.0.0 and document their criticality and exposure. Within 7 days: Implement network segmentation to isolate affected systems, restrict inbound connections to trusted sources only, and monitor for exploitation attempts. …
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Priority Score
49
Low
Medium
High
Critical
KEV: 0
EPSS: +0.3
CVSS: +49
POC: 0
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External POC / Exploit Code
Leaving vuln.today
Destination URL
POC code from unknown sources may be malicious, contain backdoors, or be fake.
Always review and test exploit code in a safe, isolated environment (VM/sandbox).
Verify the source reputation and cross-reference with known databases (Exploit-DB, GitHub Security).