---
id: "CVE-2026-83938"
kind: "vulnerability"
aliases: ["CVE-2026-83938"]
title: "Azure Kubernetes Configuration Service: missing auth lets attackers elevate privileges"
severity: "critical"
cvss: 10.0
epss: 0.00668
exploited: false
status: "resolved"
category: "infrastructure"
products: []
ecosystems: []
tags: ["aks", "azure", "infrastructure", "kubernetes"]
not_affected_if: []
published_at: "2026-10-22T22:19:18+00:00"
first_seen_at: "2026-10-23T21:57:32+00:00"
updated_at: "2026-10-24T07:15:51+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-83938", "first_seen_at": "2026-10-23T21:57:32+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T21:59:31+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-83938", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# Azure Kubernetes Configuration Service: missing auth lets attackers elevate privileges

Azure Kubernetes Configuration Service exposes a critical function without requiring authentication. An unauthorized attacker on the network can elevate privileges.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-10-23T21:57:32+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-83938
- 2026-10-23T21:59:31+00:00 analyst — MSRC advisory (Oct 22 2026): cloud service CVE, already fully mitigated by Microsoft, no customer action. Not exploited, not publicly disclosed, no PoC. Did not search social; no CVE-id chatter expected.
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-83938

## Documents

- [advisory] MSRC: CVE-2026-83938 Azure Kubernetes Configuration Service Elevation of Privilege https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83938

## From the sources

Missing authentication for critical function in Azure Kubernetes Configuration Service allows an unauthorized attacker to elevate privileges over a network.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_