HTSlib is a library for reading and writing bioinformatics file formats
Description
HTSlib is a library for reading and writing bioinformatics file formats
Remediation
Apply vendor security updates immediately. Monitor for exploitation attempts and review access logs.
---METADATA---
VENDOR: Himmelblau
PRODUCT: Himmelblau
AFFECTED_VERSIONS: 3.0.0 to before 3.1.0
---END_METADATA---
Description Summary:
Himmelblau allows unauthenticated remote attackers to bypass tenant-scoped authentication when no tenant domain is configured, enabling unauthorized access via dynamic provider registration.
Executive Summary:
A critical authentication vulnerability in Himmelblau allows unauthenticated attackers to bypass domain restrictions and gain access to Microsoft Azure Entra ID and Intune environments.
Vulnerability Details
CVE-ID: CVE-2026-31957
Affected Software: Himmelblau Interoperability Suite
Affected Versions: 3.0.0 to before 3.1.0
Vulnerability: When deployed without a configured tenant domain in
himmelblau.conf, the suite fails to enforce tenant-scoped authentication. This allows an unauthenticated attacker to use arbitrary Entra ID domains by dynamically registering providers at runtime, bypassing intended security boundaries in remote environments.Business Impact
This flaw permits unauthorized access to sensitive enterprise identity and device management platforms. Given the CVSS score of 10, the risk includes total compromise of Azure Entra ID and Intune configurations, leading to unauthorized data access and potential lateral movement across the corporate cloud infrastructure.
Remediation Plan
Immediate Action: Update the Himmelblau suite to version 3.1.0 immediately and ensure a specific tenant domain is configured in the
himmelblau.conffile.Proactive Monitoring: Review authentication logs for login attempts from unexpected or unknown Entra ID domains and monitor for dynamic provider registration events.
Compensating Controls: Use IP allowlisting to restrict access to the Himmelblau service and implement multi-factor authentication (MFA) across all identity providers.
Exploitation Status
Public Exploit Available: false
Analyst Notes: As of Mar 11, 2026, there is no public information indicating active exploitation of this vulnerability. The "bootstrap" nature of this behavior increases the likelihood of misconfiguration in production environments.
Analyst Recommendation
Organizations relying on Himmelblau for Azure interoperability must treat this as a top-priority remediation. The ability to bypass tenant scoping effectively nullifies identity boundaries, necessitating an immediate update to version 3.1.0 to restore secure authentication.