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    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.

    Published:Mar 11, 2026
    Last Modified:Mar 23, 2026
    EPS:Mar 11, 2026
    EPSS Score:0.00017
    CVSS Score:8.8

    Affected Products

    Vendor
    Himmelblau-idm
    Product
    Himmelblau

    Exploits

    https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-44wm-q286-ghq3

    Related CVEs

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High