himmelblau-idm himmelblau up to 2.3.8/3.1.0 NSS Module privileges management

Summaryinfo

A vulnerability was found in himmelblau-idm himmelblau up to 2.3.8/3.1.0. It has been classified as critical. This impacts an unknown function of the component NSS Module. The manipulation leads to privileges management. This vulnerability is uniquely identified as CVE-2026-34397. Local access is required to approach this attack. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in himmelblau-idm himmelblau up to 2.3.8/3.1.0. This issue affects an unknown code block of the component NSS Module. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From versions 2.0.0-alpha to before 2.3.9 and 3.0.0-alpha to before 3.1.1, there is a conditional local privilege escalation vulnerability in an edge-case naming collision. Only authenticated himmelblau users whose mapped CN/short name exactly matches a privileged local group name (e.g., "sudo", "wheel", "docker", "adm") can cause the NSS module to resolve that group name to their fake primary group. If the system uses NSS results for group-based authorization decisions (sudo, polkit, etc.), this can grant the attacker the privileges of that group. This issue has been patched in versions 2.3.9 and 3.1.1.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-34397 since 03/27/2026. The exploitation is known to be difficult. An attack has to be approached locally. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 306681 (SUSE SLED15 / SLES15 Security Update : himmelblau (SUSE-SU-2026:1361-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.3.9 or 3.1.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (306681). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• himmelblau-idm

Name

• himmelblau

Version

• 2.3.0
• 2.3.1
• 2.3.2
• 2.3.3
• 2.3.4
• 2.3.5
• 2.3.6
• 2.3.7
• 2.3.8
• 3.0
• 3.1.0

Website

• Product: https://github.com/himmelblau-idm/himmelblau/

CPE 2.3info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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