CVE-2026-31979
himmelblaud-tasks: local privilege escalation via /tmp symlink attack on Kerberos ccache
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-59 |
| Vendor | himmelblau-idm |
| Product | himmelblau |
| Published | Mar 11, 2026 |
| Last Updated | Mar 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
himmelblau-idm / himmelblau
>= 1.0.0, < 2.3.8 >= 3.0.0-alpha, < 3.1.0