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Netskope Security Advisory

NSKPSA-2026-004 - Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue

Netskope Security Advisory – Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue

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.

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Security Advisory ID: NSKPSA-2026-004

Version: 1.0

Status: Published

First Published: October 16, 2026

 

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.

 

Affected Product(s) and Version(s)
Netskope Client v141 and prior

 

CVE-ID(s)
CVE-2026-12254

 

Remediation

Netskope has patched the issue and customers are recommended to use the patched version as specified 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)

 

Netskope Public
Netskope download Instructions – Download Netskope Client and Scripts – Netskope Support

 

Workaround
There are no workarounds for this issue

 

General Security Best Practices
Netskope recommends following the security best practices and ensuring the users are not connecting to untrusted networks in public places https://support.netskope.com/s/article/Secure-Tenant-Configuration

 

Special Notes and Acknowledgement

 

Exploitation and Public Disclosures
Netskope is not aware of any active exploitation of this gap at the time of release of this advisory.

 

Revision History

VersionDateSectionNotes
1.0October 16, 2026AllInitial Security Advisory

 

Legal Disclaimer:
To the maximum extent permitted by applicable law, information provided in this notice is provided “as is” without warranty of any kind. Your use of the information in this notice or materials linked herein are at your own risk. This notice and all aspects of Netskope’s Product Security Incident Response Policy are subject to change without notice. Response is not guaranteed for any specific issue or class of issues. Your entitlements regarding warranties, support and maintenance, including vulnerabilities in any Netskope software or service, are
governed solely by the applicable master agreement between Netskope and you. The statements in this notice do not modify, enlarge or otherwise amend any of your rights under the applicable master agreement, or create any additional warranties or commitments.

 

About Netskope
Netskope (NASDAQ: NTSK), a leader in modern security and networking for the cloud and AI era, addresses the needs of both security and networking teams by providing optimized access and real-time, context-based security for the AI ecosystem inclusive of agents, applications, tools, LLMs, people, devices, and data. Thousands of customers, including more than 30 of the Fortune 100, trust the Netskope One platform, its Zero Trust Engine, and its powerful NewEdge network to reduce risk and gain full visibility and control over cloud, AI, SaaS, web, and private applications – providing security and accelerating performance without trade-offs. Learn more at
www.netskope.com, Netskope.ai, on LinkedIn, and Instagram.