What’s Vulnerable › Vulnerabilities
CVE-2026-31979: himmelblaud-tasks: local privilege escalation via /tmp symlink attack on Kerberos ccache
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-11 · updated 2026-06-17
- Weakness: CWE-59
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.
Affected products
- himmelblau-idm himmelblau: from 1.0.0 before 2.3.8; from 3.0.0 before 3.1.0 — fixed in 2.3.8, 3.1.0
How to fix
Upgrade to a fixed version: himmelblau-idm himmelblau 2.3.8, 3.1.0. Check the vendor advisory for mitigations.
References
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