himmelblau-idm himmelblau up to 2.3.7/3.0.x /tmp/krb5cc_ link following

CVSS Meta Temp Score
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CTI Interest Score
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8.0$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in himmelblau-idm himmelblau up to 2.3.7/3.0.x. This impacts an unknown function of the file /tmp/krb5cc_. This manipulation causes link following. This vulnerability is tracked as CVE-2026-31979. The attack is restricted to local execution. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in himmelblau-idm himmelblau up to 2.3.7/3.0.x. It has been declared as critical. Affected by this vulnerability is an unknown code of the file /tmp/krb5cc_. The manipulation with an unknown input leads to a link following vulnerability. The CWE definition for the vulnerability is CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-31979 since 03/10/2026. The exploitation appears to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 304855 (openSUSE 16 : Feature update for himmelblau (SUSE-SU-openSUSE-FU-2026:20453-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.3.8 or 3.1.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (304855). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.1
VulDB Meta Temp Score: 8.0

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CNA Base Score: 8.8
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Link following
CWE: CWE-59
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 304855
Nessus Name: openSUSE 16 : Feature update for himmelblau (SUSE-SU-openSUSE-FU-2026:20453-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: himmelblau 2.3.8/3.1.0

Timelineinfo

03/10/2026 CVE reserved
03/11/2026 +1 days Advisory disclosed
03/11/2026 +0 days VulDB entry created
04/05/2026 +25 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-31979 (🔒)
GCVE (CVE): GCVE-0-2026-31979
GCVE (VulDB): GCVE-100-350557

Entryinfo

Created: 03/11/2026 21:02
Updated: 04/05/2026 03:44
Changes: 03/11/2026 21:02 (64), 03/14/2026 21:05 (2), 03/17/2026 04:17 (11), 04/05/2026 03:44 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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