CVE-2026-34397: himmelblau-idm himmelblau Improper Privilege Management
Vulnerability summary
CVE-2026-34397 is a high (CVSS 7.0) Improper Privilege Management vulnerability in himmelblau-idm himmelblau. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 01-04-2026PublishedVulnerability first disclosed.
- 04-04-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 2 sources · 1 version- CVE.orgCNA6.3MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:NDiffers
EPSS trend
Probability
0.15%
Chance of exploitation in the next 30 days
Percentile
4%
Versus all other CVEs
30-day change
-0.01 pp
From 0.16% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundHimmelblau
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Himmelblau-idm1 product
- himmelblau≥ 2.0.0-alpha, < 2.3.9 | ≥ 3.0.0-alpha, < 3.1.1 | ≥ 2.0.0, < 2.3.9 | ≥ 3.0.0, < 3.1.1
Opensuse1 product
- himmelblau&distro=openSUSE Tumbleweed< 2.3.9+git0.a9fd29b-1.1
2 vendors · 2 products
References
4 links- github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-v7xx-7mqc-g835X Refsource CONFIRMExploitMitigationVendor Advisory