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CVE-2026-119990 – Elevation of Privilege (Missing Authentication) – Microsoft Azure OpenAI 1.0.0 to

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Summary

CVE-2026-119990 is a missing-authentication vulnerability (CWE-306) in Microsoft Azure OpenAI that lets an unauthorized attacker elevate privileges over a network. It is rated Critical with a CVSS v3.1 base score of 9.8. Microsoft published it on November 10, 2026.

Technical details

  • Root cause: Missing authentication for a critical function (CWE-306) in Azure OpenAI.
  • Trigger conditions: The CVE record lists no privileges and no user interaction as requirements, and attack complexity is low.
  • Attack vector: Network. A remote, unauthenticated attacker can reach the vulnerable function.
  • Impact: Elevation of privilege. The CVSS vector rates confidentiality, integrity and availability impact as High.
  • Exploit maturity: The CVSS vector carries temporal metrics E:U (exploit code maturity unproven) and RL:O (official fix). Public exploit code is not confirmed.
  • Further technical detail was not found in the public CVE record.

Affected software

  • Microsoft Azure OpenAI, versions 1.0.0 through versions prior to hyena-infra-build-official/20260923.14.

Severity

  • CVSS v3.1 base score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Mitigation and recommended actions

  • Immediate: Use Azure OpenAI at build hyena-infra-build-official/20260923.14 or later, as listed in the CVE record. Consult the Microsoft Security Response Center advisory to confirm whether Microsoft has already applied the fix to your service or whether you need to act.
  • If you cannot confirm the fix: The research did not find any Microsoft-published workarounds. As general precautions, restrict network access to Azure OpenAI endpoints (for example, private endpoints or IP allow-lists) and review access logs for unexpected unauthenticated activity.

References

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