CVE-2026-126239

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-126239", "assignerOrgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8", "state": "PUBLISHED", "assignerShortName": "fortinet", "dateReserved": "2026-11-10T20:09:37.231Z", "datePublished": "2026-11-11T21:31:35.102Z", "dateUpdated": "2026-11-12T15:31:42.952Z"}, "containers": {"cna": {"affected": [{"vendor": "Fortinet", "product": "FortiAuthenticator", "cpes": ["cpe:2.3:a:fortinet:fortiauthenticator:8.0.3:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:8.0.2:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:8.0.1:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:8.0.0:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.10:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.9:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.8:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.7:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.6:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.5:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.4:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.3:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.2:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.1:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.0:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "versions": [{"versionType": "semver", "version": "8.0.0", "lessThanOrEqual": "8.0.3", "status": "affected"}, {"versionType": "semver", "version": "6.6.0", "lessThanOrEqual": "6.6.10", "status": "affected"}]}], "descriptions": [{"lang": "en", "value": "A stack-based buffer overflow vulnerability in Fortinet FortiAuthenticator 8.0.0 through 8.0.3, FortiAuthenticator 6.6.0 through 6.6.10 may allow an unauthenticated attacker to crash the FSSO subsystem via crafted http requests"}], "providerMetadata": {"orgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8", "shortName": "fortinet", "dateUpdated": "2026-11-11T21:31:35.102Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-121", "description": "Execute unauthorized code or commands", "type": "CWE"}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C"}}], "solutions": [{"lang": "en", "value": "Upgrade to FortiAuthenticator version 8.0.4 or above\nUpgrade to FortiAuthenticator version 6.6.11 or above"}], "references": [{"name": "https://fortiguard.fortinet.com/psirt/FG-IR-26-254", "url": "https://fortiguard.fortinet.com/psirt/FG-IR-26-254"}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-11-12T14:32:33.301986Z", "id": "CVE-2026-126239", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-12T15:31:42.952Z"}}]}}

{}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:fortinet:fortiauthenticator:8.0.3:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:8.0.2:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:8.0.1:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:8.0.0:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.10:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.9:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.8:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.7:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.6:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.5:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.4:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.3:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.2:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.1:*:*:*:*:*:*:*", "cpe:2.3:a:fortinet:fortiauthenticator:6.6.0:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "product": "FortiAuthenticator", "vendor": "Fortinet", "versions": [{"lessThanOrEqual": "8.0.3", "status": "affected", "version": "8.0.0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.10", "status": "affected", "version": "6.6.0", "versionType": "semver"}]}], "source": "psirt@fortinet.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A stack-based buffer overflow vulnerability in Fortinet FortiAuthenticator 8.0.0 through 8.0.3, FortiAuthenticator 6.6.0 through 6.6.10 may allow an unauthenticated attacker to crash the FSSO subsystem via crafted http requests"}], "id": "CVE-2026-126239", "lastModified": "2026-11-12T19:14:29.340", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "psirt@fortinet.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-126239", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-12T14:32:33.301986Z", "version": "2.0.3"}}]}, "published": "2026-11-11T22:17:23.460", "references": [{"source": "psirt@fortinet.com", "url": "https://fortiguard.fortinet.com/psirt/FG-IR-26-254"}], "sourceIdentifier": "psirt@fortinet.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}], "source": "psirt@fortinet.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.0.0,8.0.3]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.0,6.6.10]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "FortiAuthenticator", "source": "cna", "vendor": "Fortinet"}, "product": "fortiauthenticator", "vendor": "fortinet"}], "created": "2026-11-12T16:15:05.448282+00:00", "title": "Stack-Based Buffer Overflow in FortiAuthenticator Allows Crash of FSSO Subsystem", "updated": "2026-11-13T01:45:12.596134+00:00", "vendors": ["fortinet", "fortinet$PRODUCT$fortiauthenticator"]}