# CVE-2026-85889 — Microsoft Azure AI Foundry

> As of 2026-09-19, CVE-2026-85889 is a CRITICAL-severity vulnerability in Microsoft Azure AI Foundry, CVSS v3.1 10, EPSS 0.4% (41.4th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-85889, most recently “Microsoft September 2026 Cloud Disclosure: 18 Elevation-of-Privilege, Information-Disclosure, and Spoofing Flaws Across Azure and Copilot AI Products, Plus a Windows Secure Kernel EoP (CVE-2026-85921)”.

**Last updated:** 2026-09-19

## What is CVE-2026-85889?

Missing authentication for critical function in Azure AI Foundry allows an unauthorized attacker to elevate privileges over a network.

The record classifies CVE-2026-85889 under weakness class [CWE-306](https://cwe.mitre.org/data/definitions/306.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 3 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 10 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 41.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-17, last modified 2026-09-19

## Is CVE-2026-85889 being exploited?

It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Microsoft**: Azure AI Foundry

## How to fix CVE-2026-85889

No vendor patch reference has been recorded for CVE-2026-85889 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-85889

1 tracked threat in the Threadlinqs corpus references CVE-2026-85889, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Microsoft September 2026 Cloud Disclosure: 18 Elevation-of-Privilege, Information-Disclosure, and Spoofing Flaws Across Azure and Copilot AI Products, Plus a Windows Secure Kernel EoP (CVE-2026-85921)](https://intel.threadlinqs.com/threat/TL-2026-2563) — CRITICAL · 2026-09-18

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-09-19. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85889)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-85889
Full detection coverage and IOCs for threats exploiting CVE-2026-85889 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp