---
id: CVE-2026-12254
title: Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue
summary: >-
  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 Por…
severity: medium
cvss: 6.4
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-613
vendor: Netskope Inc.
product: Netskope Client
affected:
  - netskope_client < 142
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T15:37:11.423Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-12254'
references:
  - url: >-
      https://www.netskope.com/resources/netskope-resources/netskope-security-advisory-nskpsa-2026-004
tags:
  - cve.org
ingestedAt: '2026-10-19T16:32:30.076Z'
---

## Overview

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

- `netskope_client < 142`

## Remediation

Netskope has fixed the gap and released the patch as listed below:
R142 and above
R141 (141.1.7.2827 and above)
R138 (138.1.15.2826 and above)
R135 (135.1.7.2827 and above)