CVE-2026-119990: Azure OpenAI Elevation of Privilege Vulnerability
CVE-2026-119990 is an elevation of privilege vulnerability in Azure OpenAI, rated Critical by Microsoft, with a CVSS 3.1 base score of 9.8 (Critical). An attacker can exploit it remotely over the network, without any privileges and without user interaction. Microsoft has not reported exploitation in the wild. Microsoft released the fix on 10 November 2026 in the November 2026 Patch Tuesday. It affects 1 product in 1 product family (Azure).
Key facts
- CVE ID
- CVE-2026-119990
- Severity
- Critical CVSS 9.8
- Microsoft severity
- Critical
- Impact
- Elevation of Privilege
- Exploited in the wild
- No
- Publicly disclosed
- No
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- November 2026 Patch Tuesday
- Product families
- Azure
CVSS score and vector
Microsoft scores CVE-2026-119990 at 9.8 (temporal 8.5) using CVSS 3.1. 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
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | High |
| Integrity impact | High |
| Availability impact | High |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Missing authentication for critical function in Azure OpenAI allows an unauthorized attacker to elevate privileges over a network.
Frequently asked questions (Microsoft)
Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?
This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency.
Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.
Affected products (1)
Azure
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Azure Open AI | Release Notes | Security Update | hyena-infra-build-official/20260923.14 |
Acknowledgments
- Anonymous
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. | |
| 1.1 | Updated the Customer Action Required information and FAQ to clarify that Microsoft has fully mitigated this vulnerability and no customer action is required. |