Vulnerability Details CVE-2026-31979
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.0%
CVSS Severity
CVSS v3 Score 8.8
Products affected by CVE-2026-31979
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cpe:2.3:a:himmelblau-idm:himmelblau:*
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cpe:2.3:a:himmelblau-idm:himmelblau:1.0.0
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cpe:2.3:a:himmelblau-idm:himmelblau:1.1.0
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cpe:2.3:a:himmelblau-idm:himmelblau:1.2.0
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cpe:2.3:a:himmelblau-idm:himmelblau:1.2.1
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cpe:2.3:a:himmelblau-idm:himmelblau:1.2.2
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cpe:2.3:a:himmelblau-idm:himmelblau:1.2.3
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cpe:2.3:a:himmelblau-idm:himmelblau:1.3.0