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CVE-2026-12254— Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue

Quick assessment

Affected
Netskope Inc. Netskope Client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netskope 已收到关于其客户端（NSClient）可能存在安全漏洞的通知：当安装了 Netskope 客户端的系统连接到设有门户认证（Captive Portal）的接入点，并随后切换至一个已具备互联网连接的网络时，该门户认证界面可能不会自动关闭。此行为可能被攻击者利用，通过部署恶意接入点（Rogue Access Point）来诱导用户访问恶意网站或窃取数据。该问题影响所有早于 R142 的版本。

CVSS 6.4 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
Netskope Inc. Netskope Client < 142 affected
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I. Basic Information for CVE-2026-12254

Vulnerability Information
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Vulnerability Title
Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
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: CVE Program / CVE List V5
Vulnerability Type
不充分的会话过期机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Netskope Inc. Netskope Client 0 ~ 142 -

II. Public POCs for CVE-2026-12254

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III. Intelligence Information for CVE-2026-12254

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Other References for CVE-2026-12254 (1)

IV. Related Vulnerabilities

Same product: Netskope Client
Same vendor: Netskope Inc.
Same weakness: CWE-613

V. Comments for CVE-2026-12254

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