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CVE-2026-21806

3.1 · LOW

HCL BigFix Service Management is affected by an Administrative Session Concurrency vulnerability.

Published Sep 18, 2026hcltechCWE-557EPSS 0.20%

Overview

CVE-2026-21806 is a low-severity vulnerability affecting hcltech bigfix_service_management. It was published on September 18, 2026 and has a CVSS 3.1 base score of 3.1 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.1, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

HCL BigFix Service Management is affected by an Administrative Session Concurrency vulnerability. The application allows multiple simultaneous authenticated sessions for the same administrative account, which could enable an unauthorized attacker to predict or hijack valid session identifiers. Successful exploitation allows an attacker to compromise affected administrative sessions and execute actions with full privileged user permissions.

Remediation

Check the references section for vendor advisories and patches from hcltech. Update bigfix_service_management to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refsupport.hcl-software.com/csm?id=kb_article&sysparm_article=KB0133592

How CyberStrike helps

Frequently asked questions

What is CVE-2026-21806?

CVE-2026-21806 is a low-severity vulnerability affecting hcltech bigfix_service_management. It was published on September 18, 2026 and has a CVSS 3.1 base score of 3.1 (LOW).

How severe is CVE-2026-21806?

This vulnerability has a CVSS 3.1 base score of 3.1, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-21806?

Check the references section for vendor advisories and patches from hcltech. Update bigfix_service_management to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-21806?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-21806 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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