How severe is CVE-2026-34397?

CVE-2026-34397 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-34397 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34397?

CVE-2026-34397 affects Himmelblau-idm Himmelblau. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34397?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34397 have an EU (EUVD) identifier?

Yes. CVE-2026-34397 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17983.

When was CVE-2026-34397 published?

CVE-2026-34397 was published on 2026-04-01 and last updated on 2026-06-17.

CVE-2026-34397

CVE-2026-34397 is a medium-severity vulnerability in Himmelblau-idm Himmelblau with a CVSS 3.x base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-269.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17983
Weakness: CWE-269
Affected product: Himmelblau-idm Himmelblau
Published: 2026-04-01
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-34397?: CVE-2026-34397 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-34397 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34397?: CVE-2026-34397 affects Himmelblau-idm Himmelblau. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34397?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34397 have an EU (EUVD) identifier?: Yes. CVE-2026-34397 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17983.
When was CVE-2026-34397 published?: CVE-2026-34397 was published on 2026-04-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:himmelblau-idm:himmelblau:*:*:*:*:*:*:*:*

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