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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-21806
StatePUBLISHED
AssignerHCL
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 12:17:24 UTC
Updated2026-10-14 17:36:23 UTC
DescriptionHCL 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001530000 probability, percentile 0.039660000 (date 2026-10-14)

Problem Types: CWE-557 | CWE-557 CWE-557 Concurrency Issues

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary3.1LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNACVSS3.1LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Hcltech Bigfix Service Management 27 - All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA HCL Software HCL BigFix Service Management affected Version 27 Not specified

References

ReferenceSourceLinkTags
support.hcl-software.com/csm [email protected] support.hcl-software.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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