{"id":"CVE-2026-12254","state":"PUBLISHED","title":"Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue","description":"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","publishedAt":"2026-10-19T15:37:11.423Z","updatedAt":"2026-10-21T16:31:04.871Z","severity":{"score":6.4,"label":"Medium","version":"4.0","vector":"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","source":"Netskope"},"assigner":"Netskope","products":["Netskope Inc. Netskope Client"],"affected":[{"vendor":"Netskope Inc.","product":"Netskope Client","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"142","versionType":"custom"}],"platforms":["Windows","MacOS"]}],"references":["https://www.netskope.com/resources/netskope-resources/netskope-security-advisory-nskpsa-2026-004"],"weaknesses":["CWE-613"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/12xxx/CVE-2026-12254.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-12254","state":"PUBLISHED","datePublished":"2026-10-19T15:37:11.423Z","dateUpdated":"2026-10-21T16:31:04.871Z","assignerShortName":"Netskope","assignerOrgId":"bf992f6a-e49d-4e94-9479-c4cff32c62bc","dateReserved":"2026-06-15T08:38:15.229Z"},"containers":{"cna":{"title":"Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue","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"}],"affected":[{"vendor":"Netskope Inc.","product":"Netskope Client","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"142","versionType":"custom"}],"platforms":["Windows","MacOS"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-613","lang":"en","description":"CWE-613 Insufficient session expiration","type":"CWE"}]}],"providerMetadata":{"shortName":"Netskope","orgId":"bf992f6a-e49d-4e94-9479-c4cff32c62bc","dateUpdated":"2026-10-21T16:31:04.871Z"},"datePublic":"2026-10-16T15:16:00.000Z","impacts":[{"capecId":"CAPEC-593","descriptions":[{"lang":"en","value":"CAPEC-593 Session Hijacking"}]}],"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":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-20T19:28:18.204Z"}}]}}}