Authorization Flaw in Himmelblau (CVE-2026-45108)
Summary
Vulnerability in Himmelblau (CVE-2026-45108). Confidential information can be exposed externally. Mitigation: upgrade to 3.1.5 or later.
Original description
The description as published by the source.
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: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-45108 has been found in Himmelblau.
Confidential information can be exposed externally. CVSS score: 8.4/10.
What to do: upgrade Himmelblau to 3.1.5 or later.
If unsure, ask your IT team or search "Himmelblau CVE-2026-45108" on the vendor's site.
CVE-2026-45108 (Himmelblau) — CWE-863 / CVSS v3 8.4
Attack vector: remote (network-reachable) / no user interaction
Patched: 3.1.5 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Incorrect authorization (CWE-863) exists in Himmelblau.
Check the vendor advisory for the affected versions of Himmelblau.
Severity: High (CVSS 8.4/10). Confidential information can be exposed externally.
Update to 3.1.5.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Himmelblau' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'Himmelblau' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Himmelblauを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade Himmelblau to 3.1.5ステージング環境で 3.1.5 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov