First published 9/27/2026, 6:01:15 AM · Last updated 9/27/2026, 6:01:15 AM

CVE-2026-19490: Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability

CISA reports CVE-2026-19490 as an authentication-bypass vulnerability affecting Citrix NetScaler ADC and NetScaler Gateway that may allow an unauthenticated remote actor to bypass authentication. The advisory instructs stakeholders to apply vendor mitigations and follow CISA BOD 26-04 and Forensics Triage Requirements.

Categories: technology

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 8/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 4/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 4/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 5/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Positivity: 2/10How harmful or beneficial the event is, from strongly harmful (1) to strongly positive (10).
Urgency: 7/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Why it matters

If unmitigated, the flaw could enable unauthorized remote access to affected NetScaler appliances and requires action per CISA guidance.

Location

Sources

CVE-2026-19490: Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability

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