---
id: CVE-2026-39910
title: >-
  STACKIT IaaS API contains a missing authorization check vulnerability that
  allows authenticated, low-privileged attackers to escalate privileges to full
  organization compromise by attaching arbitrary service accounts to virtual
  machines …
summary: >-
  STACKIT IaaS API contains a missing authorization check vulnerability that
  allows authenticated, low-privileged attackers to escalate privileges to full
  organization compromise by attaching arbitrary service accounts to virtual
  machines …
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-862
published: '2026-06-08'
updated: '2026-08-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-39910'
references:
  - url: 'https://status.stackit.cloud'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/stackit-iaas-api-privilege-escalation-via-service-account-attachment
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00469
epssPercentile: 0.38001
ingestedAt: '2026-08-24T12:02:50.415Z'
---

## Overview

STACKIT IaaS API contains a missing authorization check vulnerability that allows authenticated, low-privileged attackers to escalate privileges to full organization compromise by attaching arbitrary service accounts to virtual machines they control. Attackers can exploit the unvalidated PUT servers service-accounts endpoint to attach high-privileged service accounts and query the Instance Metadata Service to retrieve OAuth2 tokens, bypassing tenant boundaries and gaining unauthorized control over the entire organization environment.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.