STACKIT IaaS API prior 2026-05-28 Instance Metadata Service authorization

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in STACKIT IaaS API. This impacts an unknown function of the component Instance Metadata Service. Performing a manipulation results in authorization. This vulnerability is cataloged as CVE-2026-39910. It is possible to initiate the attack remotely. There is no exploit available. This product is a managed service. It is not possible for users to maintain vulnerability countermeasures themselves. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in STACKIT IaaS API. This affects an unknown functionality of the component Instance Metadata Service. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was shared by Lior Fatiha. It is possible to read the advisory at status.stackit.cloud. This vulnerability is uniquely identified as CVE-2026-39910 since 04/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2026-05-28 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Managed Service

  • yes

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-862 / CWE-863 / CWE-285
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Status: 🔍

0-Day Time: 🔒

Upgrade: IaaS API 2026-05-28

Timelineinfo

04/07/2026 CVE reserved
06/08/2026 +62 days Advisory disclosed
06/08/2026 +0 days VulDB entry created
06/08/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: status.stackit.cloud
Researcher: Lior Fatiha
Status: Confirmed

CVE: CVE-2026-39910 (🔒)
GCVE (CVE): GCVE-0-2026-39910
GCVE (VulDB): GCVE-100-369279

Entryinfo

Created: 06/08/2026 20:20
Changes: 06/08/2026 20:20 (42), 06/08/2026 20:21 (35)
Complete: 🔍
Cache ID: 216::103

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