CVE-2026-45108— Himmelblau: Authentication Bypass via Cross-User Local Session Impersonation in Device Authorization Grant (DAG) Flow
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-45108
Vulnerability Information
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Vulnerability Title
Himmelblau: Authentication Bypass via Cross-User Local Session Impersonation in Device Authorization Grant (DAG) Flow
Source: NVD (National Vulnerability Database)
Vulnerability Description
Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From 2.0.0 to before 3.1.5 and 2.3.11, Himmelblau contained an authentication bypass vulnerability in the Device Authorization Grant (DAG) flow that allowed a user within the same Entra ID domain to obtain a local Unix session as another user by providing their own valid credentials. The vulnerability existed in the token_validate function, which validated domain aliases for legitimate multi-domain scenarios but failed to verify that the local part (username) of the authenticated user's UPN matched the requested account username. The function only compared domains, not the complete usernames. This vulnerability is fixed in 3.1.5 and 2.3.11.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| himmelblau-idm | himmelblau | >= 2.0.0, < 2.3.11 | - |
II. Public POCs for CVE-2026-45108
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-45108 (1)
IV. Related Vulnerabilities
Same product: himmelblau
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himmelblau: NSS fake-primary group lookup reintroduces name - CVE-2026-31979
himmelblaud-tasks: local privilege escalation via /tmp symli - CVE-2026-31957
Himmelblau unset domain configuration can allow any-tenant a - CVE-2025-59044
Himmelblau vulnerable to GID collision via group name-derive - CVE-2025-54882
Himmelblau's Kerberos credential cache collection is world r
Same vendor: himmelblau-idm
- CVE-2026-34397
himmelblau: NSS fake-primary group lookup reintroduces name - CVE-2026-31979
himmelblaud-tasks: local privilege escalation via /tmp symli - CVE-2026-31957
Himmelblau unset domain configuration can allow any-tenant a - CVE-2025-59044
Himmelblau vulnerable to GID collision via group name-derive - CVE-2025-54882
Himmelblau's Kerberos credential cache collection is world r
Same weakness: CWE-863
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V. Comments for CVE-2026-45108
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