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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.

PUBLISHED Reserved 2026-04-07 | Published 2026-06-08 | Updated 2026-06-08 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

Missing Authorization

Product status

Default status
affected

Any version before 2026-05-28
affected

Credits

Lior Fatiha finder

References

status.stackit.cloud release-notes

www.vulncheck.com/...calation-via-service-account-attachment third-party-advisory

cve.org (CVE-2026-39910)

nvd.nist.gov (CVE-2026-39910)

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