HCL BigFix Service Management was affected with Admin Session Concurrency vulnerability (CVE-2026-21806) (CVE-2026-21806) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-21806

HCL BigFix Service Management was affected with Admin Session Concurrency vulnerability (CVE-2026-21806)

Answer in brief

CVE-2026-21806 records a Unknown severity vulnerability in HCL BigFix Service Management was affected with Admin Session Concurrency vulnerability (CVE-2026-21806). The current sources do not mark it as known exploited. The current feed maps HCL Software/HCL BigFix Service Management (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 18, 2026Updated Sep 18, 2026Source checked Sep 18, 2026First seen by HOL Sep 18, 2026Material review Sep 18, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps HCL Software/HCL BigFix Service Management (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
HCL Software/HCL BigFix Service Managementgeneric	Version 27	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for HCL Software/HCL BigFix Service Management.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 18, 2026

Sources and claim methodology

Source referencesupport.hcl-software.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.