{"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":"2026-10-21T16:31:04.871Z"},"containers":{"cna":{"providerMetadata":{"orgId":"bf992f6a-e49d-4e94-9479-c4cff32c62bc","shortName":"Netskope","dateUpdated":"2026-10-21T16:31:04.871Z"},"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 (135.1.26.2824 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 (135.1.26.2824 and above)<br>"}]}],"credits":[{"lang":"en","value":"Loïc Croche (Independant security researcher)","type":"finder"}],"source":{"advisory":"NSKPSA-2026-004","discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-20T19:28:10.399796Z","id":"CVE-2026-12254","options":[{"Exploitation":"none"},{"Automatable":"no"},{"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":"2026-10-20T19:28:18.204Z"}}]}}