CVE-2026-93866

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93866", "assignerOrgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "state": "PUBLISHED", "assignerShortName": "WatchGuard", "dateReserved": "2026-09-18T19:29:25.403Z", "datePublished": "2026-10-27T15:52:27.871Z", "dateUpdated": "2026-11-04T20:26:51.215Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "shortName": "WatchGuard", "dateUpdated": "2026-10-27T15:52:27.871Z"}, "title": "Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write", "descriptions": [{"lang": "en", "value": "An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled."}], "affected": [{"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "2025.1", "versionType": "custom", "lessThan": "2026.4"}, {"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.12.4"}], "defaultStatus": "unaffected", "platforms": ["Default"]}, {"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.5.22"}], "defaultStatus": "unaffected", "platforms": ["T15/T35"]}], "references": [{"url": "https://psirt.watchguard.com/CVE-2026-93866", "tags": ["vendor-advisory"]}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.5.22"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "2025.1", "versionEndExcluding": "2026.4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.12.4"}]}]}], "metrics": [{"cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "baseScore": 9.2, "baseSeverity": "CRITICAL"}}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-190", "type": "CWE", "cweId": "CWE-190"}, {"lang": "en", "description": "CWE-288", "type": "CWE", "cweId": "CWE-288"}, {"lang": "en", "description": "CWE-787", "type": "CWE", "cweId": "CWE-787"}]}], "credits": [{"lang": "en", "value": "Laurent GAFFIE , secorizon.com", "type": "finder"}], "configurations": [{"lang": "en", "value": "This vulnerability affects Firebox deployments with the Access Portal enabled.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>This vulnerability affects Firebox deployments with the Access Portal enabled.</p>"}]}], "solutions": [{"lang": "en", "value": "Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22"}]}], "exploits": [{"lang": "en", "value": "WatchGuard is not aware of any exploitation of this vulnerability in the wild.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "WatchGuard is not aware of any exploitation of this vulnerability in the wild."}]}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-11-04T18:45:57.731661Z", "id": "CVE-2026-93866", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-04T20:26:51.215Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-93866", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-11-04T18:45:57.731661Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-04T18:45:58.401Z"}}], "cna": {"title": "Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write", "credits": [{"lang": "en", "type": "finder", "value": "Laurent GAFFIE , secorizon.com"}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 9.2, "baseSeverity": "CRITICAL", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}], "affected": [{"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "2025.1", "lessThan": "2026.4", "versionType": "custom"}, {"status": "affected", "version": "12.0", "lessThan": "12.12.4", "versionType": "custom"}], "platforms": ["Default"], "defaultStatus": "unaffected"}, {"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "12.0", "lessThan": "12.5.22", "versionType": "custom"}], "platforms": ["T15/T35"], "defaultStatus": "unaffected"}], "exploits": [{"lang": "en", "value": "WatchGuard is not aware of any exploitation of this vulnerability in the wild.", "supportingMedia": [{"type": "text/html", "value": "WatchGuard is not aware of any exploitation of this vulnerability in the wild.", "base64": false}]}], "solutions": [{"lang": "en", "value": "Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22", "supportingMedia": [{"type": "text/html", "value": "Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22", "base64": false}]}], "references": [{"url": "https://psirt.watchguard.com/CVE-2026-93866", "tags": ["vendor-advisory"]}], "descriptions": [{"lang": "en", "value": "An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190"}, {"lang": "en", "type": "CWE", "cweId": "CWE-288", "description": "CWE-288"}, {"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787"}]}], "configurations": [{"lang": "en", "value": "This vulnerability affects Firebox deployments with the Access Portal enabled.", "supportingMedia": [{"type": "text/html", "value": "<p>This vulnerability affects Firebox deployments with the Access Portal enabled.</p>", "base64": false}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "12.5.22", "versionStartIncluding": "12.0"}, {"criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "2026.4", "versionStartIncluding": "2025.1"}, {"criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "12.12.4", "versionStartIncluding": "12.0"}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "shortName": "WatchGuard", "dateUpdated": "2026-10-27T15:52:27.871Z"}}}, "cveMetadata": {"cveId": "CVE-2026-93866", "state": "PUBLISHED", "dateUpdated": "2026-11-04T20:26:51.215Z", "dateReserved": "2026-09-18T19:29:25.403Z", "assignerOrgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "datePublished": "2026-10-27T15:52:27.871Z", "assignerShortName": "WatchGuard"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["Default"], "product": "Fireware OS", "vendor": "WatchGuard", "versions": [{"lessThan": "2026.4", "status": "affected", "version": "2025.1", "versionType": "custom"}, {"lessThan": "12.12.4", "status": "affected", "version": "12.0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "platforms": ["T15/T35"], "product": "Fireware OS", "vendor": "WatchGuard", "versions": [{"lessThan": "12.5.22", "status": "affected", "version": "12.0", "versionType": "custom"}]}], "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled."}], "id": "CVE-2026-93866", "lastModified": "2026-11-04T21:18:16.787", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.2, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-93866", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-11-04T18:45:57.731661Z", "version": "2.0.3"}}]}, "published": "2026-10-27T16:17:33.013", "references": [{"source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "url": "https://psirt.watchguard.com/CVE-2026-93866"}], "sourceIdentifier": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}, {"lang": "en", "value": "CWE-288"}, {"lang": "en", "value": "CWE-787"}], "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["default"], "status": "affected", "versions": {"scheme": "generic", "value": "[2025.1,2026.4)"}}, {"platform": ["default"], "status": "affected", "versions": {"scheme": "generic", "value": "[12.0,12.12.4)"}}, {"platform": ["t15/t35"], "status": "affected", "versions": {"scheme": "generic", "value": "[12.0,12.5.22)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Fireware OS", "source": "cna", "vendor": "WatchGuard"}, "product": "fireware_os", "vendor": "watchguard"}, {"configurations": [{"platform": ["t15/t35"], "status": "affected", "versions": {"scheme": "generic", "value": "[12.0,12.5.22)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Fireware OS", "source": "cna", "vendor": "WatchGuard"}, "product": "fireware_os", "vendor": "watchguard"}], "created": "2026-10-27T18:00:08.798652+00:00", "updated": "2026-10-27T18:30:07.686312+00:00", "vendors": ["watchguard", "watchguard$PRODUCT$fireware_os"]}