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CVE-2026-21531 — Vulnerability in...

CRITICAL

Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE

Published February 10, 2026Updated June 29, 2026Source: osv

Summary

Deserialization of untrusted data in the Azure AI Language Conversations Authoring client library for Python allows an unauthorized attacker to execute code over a network.

Advisory Timeline

  • First published February 10, 2026 (244 days ago).
  • Last revised June 29, 2026 — 139 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update azure-ai-language-conversations-authoring to 1.0.0b4 or later
pip install "azure-ai-language-conversations-authoring>=1.0.0b4"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
azure-ai-language-conversations-authoring
pypi
1.0.0b1, 1.0.0b2, 1.0.0b31.0.0b4

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-21531?
Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-21531?
CVE-2026-21531 affects azure-ai-language-conversations-authoring. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-21531 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-436v-jg82-p533
PYSEC-2026-289

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