---
id: "CVE-2026-12254"
kind: "vulnerability"
aliases: ["CVE-2026-12254"]
title: "Netskope client: captive portal stays open, enabling rogue access point abuse"
severity: "medium"
cvss: 6.4
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["captive-portal", "endpoint", "laptops", "netskope", "other", "wifi"]
not_affected_if: ["not-netskope-client", "r142-or-later"]
published_at: "2026-10-19T16:17:07+00:00"
first_seen_at: "2026-10-23T21:57:18+00:00"
updated_at: "2026-10-25T03:59:33+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-12254", "first_seen_at": "2026-10-23T21:57:18+00:00"}]
---

# Netskope client: captive portal stays open, enabling rogue access point abuse

The Netskope Client agent (NSClient) can leave a captive portal open when a device switches to a network that already has internet access. An attacker running a rogue access point can use that gap to direct traffic to malicious sites or exfiltrate data.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Netskope Client version against the fixed release R142 or later
- unknown

## Fix

- Upgrade the Netskope Client to `R142` or later
- unknown

## Timeline

- 2026-10-23T21:57:18+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-12254

## From the sources

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

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_