CVE-2026-12254

Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue

Published Oct 19, 2026 CVSS 4.0 · 6.4 Medium EPSS < 1% KEV · Not listed
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

Remediation

Vendor Solution

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 (135.1.26.2824 and above)

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Netskope
Netskope netskope Client
Vendors & Products Netskope
Netskope netskope Client
Type Values Removed Values Added
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
Title Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue
Weaknesses CWE-613
References
Metrics cvssV4_0

{'score': 6.4, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Netskope
Published
Updated
Oct 21, 2026, 4:31 PM
Reserved
Jun 15, 2026, 8:38 AM
Status
Awaiting Analysis
Published
Oct 19, 2026, 4:17 PM
Modified
Oct 20, 2026, 8:17 PM