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.

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-25)

CWE

CWE-557

Published

2026-09-18

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• hcltech:bigfix_service_management

References

• https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0133592

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