CVE-2026-39910 STACKIT IaaS API Privilege Escalation via Service Account Attachment
Low-privileged attackers can escalate to full organization control by attaching high-privileged service accounts to VMs via an unvalidated API endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39910?
CVE-2026-39910 is a high-severity missing authorization vulnerability in STACKIT IaaS API, published on 8 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-39910?
How do I fix CVE-2026-39910?
No fix has been published for CVE-2026-39910 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-39910 being exploited?
There is no known exploitation of CVE-2026-39910 in the wild and no public exploit code.
Sources
Also known as GHSA-p35h-r99r-9fcm.