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CVE-2026-21806HCL BigFix Service Management was affected with Admin Session Concurrency vulnerability (CVE-2026-21806)
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.
9.8 CRITICALEPSS 0.19%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.8 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | LOW | 3.1HCL (CNA) | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N |
Details
- CVE ID
- CVE-2026-21806
- Status
- Analyzed
- Assigner (CNA)
- HCL
- Published
- Sep 18, 2026
- Last modified
- 2026-10-14 17:36 UTC
- Weaknesses
- CWE-557 · Concurrency Issues
Affected Products
As published by the CNA in the CVE record.
HCL SoftwareHCL BigFix Service Management1 version range
- Version 27