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CVE-2026-12254

Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue

Medium6.4EPSS 0.31%
Published
Updated
Reserved
Assigned by
Netskope

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

Timeline

  1. ID reserved

    By Netskope

  2. · 4 months later

    Published

  3. · 2 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-12254, by who scored it
Scored byCVSSScoreVector
NetskopeCNA (assigner)4.0Medium6.4CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
NVDNVD · Awaiting Analysis4.0Medium6.4CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.31% · top 76% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.4.

Weakness

Affected products

What to do

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)

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .