All vulnerabilities
CVE-2026-21531GHSA-436v-jg82-p533PYSEC-2026-289

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

Microsoft azure-ai-language-conversations-authoringpipContainers & cloud
Open in ThreatlineRecord JSON
CVSS
9.8Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)2.58%Chance of exploitation activity in the next 30 days, higher than 85% of CVEs. Scored 27 Oct 2026FIRST EPSS
Fixed in1.0.0b4Fixed versionGitHub
Published10 Feb 2026Updated 27 Oct 2026CVE List

What fixes it

  • 1.0.0b4azure-ai-language-conversations-authoring, pipGitHub
  • 1.0.0b4Azure AI Language AuthoringCVE List
  • 1.0.0b4azure-ai-language-conversations-authoring, PyPIOSVpip install "azure-ai-language-conversations-authoring>=1.0.0b4"

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 6

  • azure-ai-language-conversations-authoring, pip< 1.0.0b4GitHub
  • Azure AI Language Authoringaffected: 1.0.0 before 1.0.0b4CVE List
  • azure-ai-language-conversations-authoring, PyPIfrom first release, fixed in 1.0.0b4OSV
  • azure-ai-language-conversations-authoring, PyPI1.0.0b1OSV
  • azure-ai-language-conversations-authoring, PyPI1.0.0b2OSV
  • azure-ai-language-conversations-authoring, PyPI1.0.0b3OSV

References 5