{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-12254", "assignerOrgId": "bf992f6a-e49d-4e94-9479-c4cff32c62bc", "state": "PUBLISHED", "assignerShortName": "Netskope", "dateReserved": "2026-06-15T08:38:15.229Z", "datePublished": "2026-10-19T15:37:11.423Z", "dateUpdated": "2026-10-19T15:37:11.423Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "bf992f6a-e49d-4e94-9479-c4cff32c62bc", "shortName": "Netskope", "dateUpdated": "2026-10-19T15:37:11.423Z"}, "title": "Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue", "datePublic": "2026-10-16T15:16:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-613", "description": "CWE-613 Insufficient session expiration", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-593", "descriptions": [{"lang": "en", "value": "CAPEC-593 Session Hijacking"}]}], "affected": [{"vendor": "Netskope Inc.", "product": "Netskope Client", "platforms": ["Windows", "MacOS"], "versions": [{"status": "affected", "version": "0", "lessThan": "142", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Netskope is notified about a potential gap in its agent (NSClient) where a system with Netskope Client while connecting to an access point with Captive Portal switches to a Network which already has internet connectivity, the Captive Portal does not close. This allows the possibility of abuse via the Captive Portal using a rogue access point to either access malicious sites or exfiltrate data.The issue impacts all versions prior to R142", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Netskope is notified about a potential gap in its agent (NSClient) where a system with Netskope Client while connecting to an access point with Captive Portal switches to a Network which already has internet connectivity, the Captive Portal does not close. This allows the possibility of abuse via the Captive Portal using a rogue access point to either access malicious sites or exfiltrate data.<div>The issue impacts all versions prior to R142<br><div>&nbsp;<br></div></div>"}]}], "references": [{"url": "https://www.netskope.com/resources/netskope-resources/netskope-security-advisory-nskpsa-2026-004"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.4, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H"}}], "solutions": [{"lang": "en", "value": "Netskope has fixed the gap and released the patch as listed below:\nR142 and above\nR141 (141.1.7.2827 and above)\nR138 (138.1.15.2826 and above)\nR135 (135.1.7.2827 and above)", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Netskope has fixed the gap and released the patch as listed below:<br>R142 and above<br>R141 (141.1.7.2827 and above)<br>R138 (138.1.15.2826 and above)<br>R135 (135.1.7.2827 and above)<br>"}]}], "credits": [{"lang": "en", "value": "Lo\u00efc Croche (Independant security researcher)", "type": "finder"}], "source": {"advisory": "NSKPSA-2026-004", "discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["Windows", "MacOS"], "product": "Netskope Client", "vendor": "Netskope Inc.", "versions": [{"lessThan": "142", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "psirt@netskope.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Netskope is notified about a potential gap in its agent (NSClient) where a system with Netskope Client while connecting to an access point with Captive Portal switches to a Network which already has internet connectivity, the Captive Portal does not close. This allows the possibility of abuse via the Captive Portal using a rogue access point to either access malicious sites or exfiltrate data.The issue impacts all versions prior to R142"}], "id": "CVE-2026-12254", "lastModified": "2026-10-19T16:17:07.807", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.4, "baseSeverity": "MEDIUM", "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": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/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": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "psirt@netskope.com", "type": "Secondary"}]}, "published": "2026-10-19T16:17:07.807", "references": [{"source": "psirt@netskope.com", "url": "https://www.netskope.com/resources/netskope-resources/netskope-security-advisory-nskpsa-2026-004"}], "sourceIdentifier": "psirt@netskope.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-613"}], "source": "psirt@netskope.com", "type": "Secondary"}]}

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