{"api_version":"1","generated_at":"2026-09-20T23:42:59+00:00","cve":"CVE-2026-21806","urls":{"html":"https://cve.report/CVE-2026-21806","api":"https://cve.report/api/cve/CVE-2026-21806.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-21806","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-21806"},"summary":{"title":"HCL BigFix Service Management was affected with Admin Session Concurrency vulnerability (CVE-2026-21806)","description":"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.","state":"PUBLISHED","assigner":"HCL","published_at":"2026-09-18 12:17:24","updated_at":"2026-09-18 20:17:15"},"problem_types":["CWE-557","CWE-557 CWE-557 Concurrency Issues"],"metrics":[{"version":"3.1","source":"psirt@hcl.com","type":"Secondary","score":"3.1","severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","baseScore":3.1,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"3.1","severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","data":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.1,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"references":[{"url":"https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0133592","name":"https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0133592","refsource":"psirt@hcl.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-21806","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21806","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"HCL Software","product":"HCL BigFix  Service Management","version":"affected Version 27","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"21806","cve":"CVE-2026-21806","epss":"0.001530000","percentile":"0.048100000","score_date":"2026-09-19","updated_at":"2026-09-20 00:14:29"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-21806","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-09-18T19:07:09.894466Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-09-18T19:07:27.165Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"HCL BigFix  Service Management","vendor":"HCL Software","versions":[{"status":"affected","version":"Version 27"}]}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"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."}],"value":"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."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.1,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-557","description":"CWE-557 Concurrency Issues","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-18T11:12:24.764Z","orgId":"1e47fe04-f25f-42fa-b674-36de2c5e3cfc","shortName":"HCL"},"references":[{"url":"https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0133592"}],"source":{"discovery":"UNKNOWN"},"title":"HCL BigFix Service Management was affected with Admin Session Concurrency vulnerability (CVE-2026-21806)","x_generator":{"engine":"Vulnogram 1.0.0"}}},"cveMetadata":{"assignerOrgId":"1e47fe04-f25f-42fa-b674-36de2c5e3cfc","assignerShortName":"HCL","cveId":"CVE-2026-21806","datePublished":"2026-09-18T11:12:24.764Z","dateReserved":"2026-01-05T16:08:06.682Z","dateUpdated":"2026-09-18T19:07:27.165Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-18 12:17:24","lastModifiedDate":"2026-09-18 20:17:15","problem_types":["CWE-557","CWE-557 CWE-557 Concurrency Issues"],"metrics":{"cvssMetricV31":[{"source":"psirt@hcl.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","baseScore":3.1,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":1.6,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-18T19:07:09.894466Z","id":"CVE-2026-21806","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"21806","Ordinal":"1","Title":"HCL BigFix Service Management was affected with Admin Session Co","CVE":"CVE-2026-21806","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"21806","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"HCL BigFix Service Management was affected with Admin Session Co"}]}}}