Microsoft Azure OpenAI: Elevation of privilege due to missing authentication
Summary
A missing authentication check for a critical function in Azure OpenAI allows an unauthorized attacker to elevate privileges over the network. The CVSS v3.1 base score is 9.8 (critical), and the CWE is CWE-306. According to the CVE record, the flaw affects Azure OpenAI builds from 1.0.0 up to but not including hyena-infra-build-official/20260923.14. The vendor advisory could not be verified, so the fix status, the technical details and the exact impact are not confirmed.
Affected
- Microsoft Azure OpenAI: 1.0.0 to < hyena-infra-build-official/20260923.14 (per CVE record)
- Cloud-hosted service: customer-side versions are not confirmed by the vendor advisory
Fixed in
Unknown. The MSRC advisory could not be retrieved, so no fixed build is confirmed.
Workaround
- No vendor workaround is documented for this CVE.
- General hardening (does not fix the flaw): rotate and revoke API keys, search code and repositories for leaked keys, and use managed identities or Entra ID authentication instead of keys.
Exploitation
- Exploitation in the wild: unknown.
- Public proof of concept: none found.
- CISA SSVC assessment (per CVE record): Exploitation none, Automatable yes, Technical Impact total.
Our recommendation
- Check whether your organisation uses Azure OpenAI resources and which versions or deployments are in scope.
- Review the MSRC advisory for this CVE and confirm whether the fix is applied by Microsoft or requires customer action.
- Rotate and revoke unused or exposed API keys, and move to managed identities or Entra ID authentication where possible.
- Review service identities, access controls and logs for unusual API calls or unexpected privilege changes.
- Check CISA KEV and the NVD entry for updates, as NVD analysis is still pending.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- MSRC Security Update Guide: CVE-2026-119990 msrc.microsoft.com
- Key-hardening guidance: Azure OpenAI service breach by hacking-as-a-service group nhimg.org
- Sibling Azure AI Foundry advisory (CVE-2026-85889, context only) thehackernews.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 10 Nov 2026, 20:37.
Original description (NVD)
Missing authentication for critical function in Azure OpenAI allows an unauthorized attacker to elevate privileges over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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