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CVE

CVE-2026-31957

Himmelblau unset domain configuration can allow any-tenant authentication at first login for remote deployments
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CVE

CVE-2026-31957

Himmelblau unset domain configuration can allow any-tenant authentication at first login for remote deployments

Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From 3.0.0 to before 3.1.0, if Himmelblau is deployed without a configured tenant domain in himmelblau.conf, authentication is not tenant-scoped. In this mode, Himmelblau can accept authentication attempts for arbitrary Entra ID domains by dynamically registering providers at runtime. This behavior is intended for initial/local bootstrap scenarios, but it can create risk in remote authentication environments. This vulnerability is fixed in 3.1.0.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
10
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31957.json, https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-q746-m2wv-qh4v, https://nvd.nist.gov/vuln/detail/CVE-2026-31957

Severity

10

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
10
EPSS Probability
0.00213%
EPSS Percentile
0.43711%
Introduced Version
f6b4beed26b55d02a81fb064b0a21fb059aa99fe
Fix Available
9079a98b44beb1c4e77215a262b95e6fd44c1dfb

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