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TI-2026-76398 Aliases CVE-2026-12254GHSA-4fcp-xcp9-9vm6

Captive portal persistence in Netskope Client allows SWG bypass

Priority LOW 28CWE-613Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-613.

Summary

Netskope Client before 142 does not close its captive portal WebView when a device switches to a network that already has internet connectivity. The flaw is insufficient session expiration (CWE-613), which leaves the portal open. A remote attacker operating a rogue access point can abuse the open portal to reach malicious sites or exfiltrate data, but a user must interact with it.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00312 24th percentileScored 2026-11-07
Fix Fixed Netskope Client (Netskope Inc.): 142

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NetskopeNetskope Clientbefore 142142Patch availableCNA
  • Netskope Client VendorNetskope Affected before 142 Fixed in 142 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:netskope:netskope:*:*:*:*:*:*:*:*——Netskope
  • cpe:2.3:a:netskope:netskope:*:*:*:*:*:*:*:* Versions — — ·Netskope

Remediation

Netskope Client fixed in 142 resolves this issue, so upgrade to version 142 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Netskope Client (Netskope Inc.) Fixed in 142

Timeline

  1. 2026-10-19 Threatist record created from CVE-2026-12254
  2. 2026-10-20 Alias added: GHSA-4fcp-xcp9-9vm6
  3. 2026-10-20 CISA SSVC decision points changed
  4. 2026-10-20 Priority changed: MEDIUM → LOW

References

Other 1

  • TI-2020-15056 Netskope Client through 77 allows low-privileged users to elevate their privileges to NT AUTHORITY\SYSTEM. CVSS 3.1HIGH 8.8
  • TI-2026-13525 Netskope Endpoint DLP Driver Integer Overflow Leading to Kernel Pool Overflow CVSS 4.0HIGH 8.7
  • TI-2024-06860 Client Enrollment Process Bypass CVSS 4.0HIGH 8.5
  • TI-2023-04599 Local privilege escalation in Netskope Client CVSS 3.1HIGH 8.8
  • TI-2021-20302 Sensitive Information store in NSClient logs CVSS 3.1HIGH 8.4
  • TI-2023-02129 Local privilege escalation in Netskope Client CVSS 3.1HIGH 7.8
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences