CVE-2026-21806
Critical
9.8 CVSS v3.1
- Published
- Sep 18, 2026
- Updated
- Oct 14, 2026
- Vendor
- Hcltech
- Affected versions
- See affected products
- Weakness
- CWE-557
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 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.
Severity
Critical (9.8)CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
- Hcltech Bigfix Service Management 27
Exploitation status
Unknown
Technical details
Technical analysis has not been written for this record yet.
Mitigation & remediation
Follow the vendor advisory linked below for patches and workarounds.