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CVE-2026-45108— Himmelblau: Authentication Bypass via Cross-User Local Session Impersonation in Device Authorization Grant (DAG) Flow

Quick assessment

Affected
himmelblau-idm himmelblau
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Himmelblau是Himmelblau开源的一个 Azure Entra ID 身份验证模块。 Himmelblau 2.0.0版本至3.1.5之前版本和2.3.11之前版本存在安全漏洞，该漏洞源于token_validate函数验证域别名时未验证用户UPN的本地部分与请求账户用户名是否匹配，可能导致同一Entra ID域内的用户通过提供自己的有效凭据获得另一个用户的本地Unix会话。

CVSS 8.4 · High EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
himmelblau-idm himmelblau >= 2.0.0, < 2.3.11 affected
>= 3.0.0-alpha, < 3.1.5 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Himmelblau 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Himmelblau是Himmelblau开源的一个 Azure Entra ID 身份验证模块。 Himmelblau 2.0.0版本至3.1.5之前版本和2.3.11之前版本存在安全漏洞，该漏洞源于token_validate函数验证域别名时未验证用户UPN的本地部分与请求账户用户名是否匹配，可能导致同一Entra ID域内的用户通过提供自己的有效凭据获得另一个用户的本地Unix会话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China 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
AI-Generated POC Premium
Qwen3.6-35B-A3B · 12469 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-45108

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Vendor Advisories for CVE-2026-45108 (1)

IV. Related Vulnerabilities

Same product: himmelblau
Same vendor: himmelblau-idm
Same weakness: CWE-863

V. Comments for CVE-2026-45108

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