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

azure-ai-language-conversations-authoring (pip)

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.

Fix it

No stable fix yet (only 1.0.0b4)

First seen: 10 Feb 2026
Last update: 10 Feb 2026, 18:30 UTC
Fixed in: azure-ai-language-conversations-authoring 1.0.0b4
Identifiers: CVE-2026-21531
Source: GitHub advisory
On the menu as: PyPI packages
Azure / M365

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE
Severity: critical. Patch status: patched.
Affected: azure-ai-language-conversations-authoring (pip)
Fixed in: azure-ai-language-conversations-authoring 1.0.0b4
Ids: CVE-2026-21531

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.

## Steps
1. This incident involves a provider (azure). Search config, CI and env templates (.env.example, wrangler.toml, vercel.json, terraform, workflow secrets) for credentials stored there. List each secret by name, where it is used, and how to rotate it. Never print secret values.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-21531") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/advisories/GHSA-436v-jg82-p533 https://github.com/pypa/advisory-database/tree/main/vulns/azure-ai-language-conversations-authoring/PYSEC-2026-289.yaml https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21531 https://nvd.nist.gov/vuln/detail/CVE-2026-21531 https://pypi.org/project/azure-ai-language-conversations-authoring
https://pwned.coffee/i/azure-ai-language-authoring-elevation-of-privilege-vulne-cve-2026-21531

Sources

Wrong fix version, or a source we missed? Send it back to chef@pwned.coffee with the source, and we'll correct it here.

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