---
id: CVE-2026-21806
title: >-
  HCL BigFix Service Management is affected by an Administrative Session
  Concurrency vulnerability
summary: >-
  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…
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-557
vendor: HCL Software
product: HCL BigFix  Service Management
affected:
  - hcl_bigfix_service_management Version 27
published: '2026-09-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:17:15.447'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21806'
references:
  - url: >-
      https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0133592
    label: psirt@hcl.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T19:07:09.894466Z'
ingestedAt: '2026-09-18T11:40:03.685Z'
epss: 0.00153
epssPercentile: 0.04788
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.