CVE-2026-12254 Netskope Client Captive Portal WebView Persistence allowing SWG bypass issue
Attackers can bypass Secure Web Gateway protections via rogue captive portals, enabling access to malicious sites or data exfiltration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-12254?
CVE-2026-12254 is a medium-severity vulnerability in Netskope Client, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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
Weakness: CWE-613
Which versions are affected by CVE-2026-12254?
How do I fix CVE-2026-12254?
No fix has been published for CVE-2026-12254 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-12254 being exploited?
There is no known exploitation of CVE-2026-12254 in the wild and no public exploit code.
Sources
Also known as GHSA-4fcp-xcp9-9vm6.