Threat Intelligence

Two Critical NetScaler Flaws Leave Citrix Customers Exposed

Dark Reading · 30 Sept 2026

Key Takeaway If your business uses Citrix NetScaler, check for vendor security advisories immediately and apply patches as soon as they are available.

Security researchers have identified two critical zero-day vulnerabilities affecting Citrix NetScaler products. According to reports, these flaws impact devices running default configurations, meaning many organisations could be exposed without having made any unusual changes to their setup.

The vulnerabilities are described as giving attackers something close to a master key into affected networks, allowing them to bypass normal security controls once exploited. Because NetScaler products are widely used as gateways for remote access and application delivery, a successful attack could provide a foothold into sensitive internal systems.

Organisations using Citrix NetScaler should check with Citrix for official advisories and patches, and review their configurations as a precaution while more details emerge.

Citrix NetScaler zero-day vulnerability

Summarised by CISO AI from Dark Reading. We link back to every original so you can read it yourself.