CVE-2026-39910

CRITICAL 9.8

STACKIT IaaS API Privilege Escalation via Service Account Attachment

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

13th

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.

CWE	CWE-862
Vendor	stackit
Product	iaas api
Published	Jun 8, 2026
Last Updated	Jun 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

STACKIT / IaaS API

0 < 2026-05-28

References

NVD ↗ CVE.org ↗ EPSS Data ↗

status.stackit.cloud: https://status.stackit.cloud vulncheck.com: https://www.vulncheck.com/advisories/stackit-iaas-api-privilege-escalation-via-service-account-attachment

Credits

Lior Fatiha