9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-21531

CVE-2026-21531: Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE

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

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-21531

CVE-2026-21531:

9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
azure-ai-language-conversations-authoring	pip	< 1.0.0b4	1.0.0b4

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the deserialization of continuation tokens for long-running operations. The from_continuation_token methods in both _JobsStrategy and _AsyncJobsPollingMethod classes were using Python's pickle module to deserialize user-controlled data. The pickle module is not secure against erroneous or maliciously constructed data. A malicious actor could craft a special serialized object that, upon deserialization with pickle.loads, would execute arbitrary code on the system. The patch replaces the insecure pickle.loads with the safer json.loads, which mitigates the remote code execution risk by only allowing the deserialization of simple JSON data structures.

Vulnerable functions

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Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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