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CVE-2026-31979— himmelblaud-tasks: local privilege escalation via /tmp symlink attack on Kerberos ccache

Quick assessment

Affected
himmelblau-idm himmelblau
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Himmelblau是Himmelblau开源的一个 Azure Entra ID 身份验证模块。 Himmelblau 3.1.0之前版本和2.3.8之前版本存在后置链接漏洞，该漏洞源于符号链接保护不足，可能导致本地权限提升。

CVSS 8.8 · High EPSS 0.20% · P9
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I. Basic Information for CVE-2026-31979

Vulnerability Information
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Vulnerability Title
himmelblaud-tasks: local privilege escalation via /tmp symlink attack on Kerberos ccache
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Himmelblau 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Himmelblau是Himmelblau开源的一个 Azure Entra ID 身份验证模块。 Himmelblau 3.1.0之前版本和2.3.8之前版本存在后置链接漏洞，该漏洞源于符号链接保护不足，可能导致本地权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
himmelblau-idm himmelblau >= 1.0.0, < 2.3.8 -

II. Public POCs for CVE-2026-31979

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III. Intelligence Information for CVE-2026-31979

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Vendor Advisories for CVE-2026-31979 (1)

IV. Related Vulnerabilities

Same product: himmelblau
Same vendor: himmelblau-idm
Same weakness: CWE-59

V. Comments for CVE-2026-31979

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