# CVE-2026-70009 — Microsoft Azure ARC

> As of 2026-09-19, CVE-2026-70009 is a CRITICAL-severity vulnerability in Microsoft Azure ARC, CVSS v3.1 9.3, EPSS 0.4% (39.7th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-70009, 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-2026-70009?

Improper limitation of a pathname to a restricted directory ('path traversal') in Azure Arc allows an unauthorized attacker to elevate privileges over a network.

The record classifies CVE-2026-70009 under weakness class [CWE-22](https://cwe.mitre.org/data/definitions/22.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 integrity. 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:** 9.3 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N/E:U/RL:O/RC:C`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 39.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.2/10 — 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-2026-70009 being exploited?

It currently carries a trending score of 39 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Microsoft**: Azure ARC

## How to fix CVE-2026-70009

No vendor patch reference has been recorded for CVE-2026-70009 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-2026-70009

1 tracked threat in the Threadlinqs corpus references CVE-2026-70009, 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-2026-70009)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-70009
Full detection coverage and IOCs for threats exploiting CVE-2026-70009 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp