Privilege escalation in Himmelblau-Idm Himmelblau
CVE-2026-34397
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.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (3.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Affected products
- Himmelblau-Idm Himmelblau — versions >= 2.0.0-alpha, < 2.3.9, >= 3.0.0-alpha, < 3.1.1
Weakness classification (CWE)
References
- github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-v7xx-7mqc-g835 (Exploit, Mitigation, Vendor Advisory)
- github.com/himmelblau-idm/himmelblau/releases/tag/2.3.9 (Product, Release Notes)
- github.com/himmelblau-idm/himmelblau/releases/tag/3.1.1 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34397?
- CVE-2026-34397 is a medium-severity vulnerability in Himmelblau-Idm Himmelblau, classified under Improper Privilege Management. CVSS score: 6.3/10. Published 2026-04-01.
- How severe is CVE-2026-34397?
- Medium severity. CVSS v3 base score is 6.3 out of 10.