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CVE-2026-31979

Himmelblau-idm Himmelblau privilege escalation

8.8 HIGHPublic exploitEPSS 0.19%
  1. Published11 Mar 2026

Description

Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. Prior to 3.1.0 and 2.3.8, the himmelblaud-tasks daemon, running as root, writes Kerberos cache files under /tmp/krb5cc_<uid> without symlink protections. Since commit 87a51ee, PrivateTmp is explicitly removed from the tasks daemon's systemd hardening, exposing it to the host /tmp. A local user can exploit this via symlink attacks to chown or overwrite arbitrary files, achieving local privilege escalation. This vulnerability is fixed in 3.1.0 and 2.3.8.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Himmelblau-idm Himmelblau≥ 1.0.0 < 2.3.8 · ≥ 3.0.0 < 3.1.0

Remediation

Fixed in
Himmelblau-idm Himmelblau≥ 2.3.8

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Frequently asked

Is CVE-2026-31979 being actively exploited?

CVE-2026-31979 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.19%.

How severe is CVE-2026-31979?

CVE-2026-31979 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.19% probability of exploitation.

Which products are affected by CVE-2026-31979?

Affected products include Himmelblau-idm Himmelblau.

How do I fix CVE-2026-31979?

Upgrade affected software to a fixed version, for example Himmelblau-idm Himmelblau 2.3.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-31979 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.