STACKIT IaaS API Privilege Escalation via Service Account Attachment (CVE-2026-39910) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-39910

STACKIT IaaS API Privilege Escalation via Service Account Attachment

Answer in brief

CVE-2026-39910 records a Unknown severity vulnerability in STACKIT IaaS API Privilege Escalation via Service Account Attachment. The current sources do not mark it as known exploited. The current feed maps STACKIT/IaaS API (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 8, 2026Updated Aug 24, 2026Source checked Aug 24, 2026First seen by HOL Aug 24, 2026Material review Aug 24, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps STACKIT/IaaS API (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
STACKIT/IaaS APIgeneric	>=0 <2026-05-28	2026-05-28

Recommended response

Check inventory. Check lockfiles and deployed manifests for STACKIT/IaaS API.
Review the reported fix. Update STACKIT/IaaS API to 2026-05-28 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 24, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.