{"id":"CVE-2026-21806","title":"HCL BigFix Service Management is affected by an Administrative Session Concurrency vulnerability","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…","severity":"low","cvss":3.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-557"],"vendor":"HCL Software","product":"HCL BigFix  Service Management","affected":["hcl_bigfix_service_management Version 27"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:17:15.447","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-21806","references":[{"url":"https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0133592","label":"psirt@hcl.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-18T19:07:09.894466Z"},"ingestedAt":"2026-09-18T11:40:03.685Z","epss":0.00153,"epssPercentile":0.04788,"slug":"CVE-2026-21806","body":"## Overview\n\nHCL 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":17,"depthScoreParts":{"impact":17.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}