CVE-2026-19490: NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: yes — in CISA KEV since 2026-09-09
EPSS: 32.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-19 · updated 2026-10-26
Weakness: CWE-288

Description

Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.

Summary

CVE-2026-19490 is a critical (CVSS 9.8) authentication bypass in Citrix NetScaler ADC and NetScaler Gateway that lets attackers reach protected resources via an alternate path or channel. It affects ADC and Gateway versions 14.1 through 73.32 and 13.1 through 63.21. The flaw is listed in CISA's Known Exploited Vulnerabilities catalog with active exploitation, and EPSS estimates a 32.7% chance of exploitation in 30 days. Apply the vendor fixes (13.1-37.277, 13.1-63.21, 14.1-73.32) or the vendor mitigations immediately, and follow CISA BOD 26-04 guidance, including assessing internet exposure.

CVE-2026-19490 ثغرة تجاوز مصادقة حرجة (CVSS 9.8) في Citrix NetScaler ADC وNetScaler Gateway تتيح للمهاجمين الوصول إلى موارد محمية عبر مسار أو قناة بديلة. تؤثر الثغرة في ADC وGateway بالإصدارات من 14.1 حتى 73.32 ومن 13.1 حتى 63.21. الثغرة مدرجة في كتالوج CISA للثغرات المعروفة بالاستغلال مع استغلال نشط، وتقدّر EPSS احتمال الاستغلال خلال 30 يوماً بنسبة 32.7%. طبّق إصلاحات المورّد (13.1-37.277 و13.1-63.21 و14.1-73.32) أو التخفيفات فوراً، واتبع إرشادات CISA BOD 26-04 بما في ذلك تقييم مدى تعرّض الأصول للإنترنت.

Affected products

Citrix NetScaler ADC: from 13.1 before 13.1-63.21; from 14.1 before 14.1-73.32 — fixed in 13.1-63.21, 14.1-73.32
Citrix Netscaler Application Delivery Controller Fips: from 13.1 before 13.1-37.277; from 14.1-66.68 through 14.1-73.32 — fixed in 13.1-37.277
Citrix Netscaler Application Delivery Controller Ndcpp: from 13.1 before 13.1-37.277 — fixed in 13.1-37.277
Citrix NetScaler Gateway: from 13.1 before 13.1-63.21; from 14.1 before 14.1-73.32 — fixed in 13.1-63.21, 14.1-73.32
NetScaler ADC: from 14.1 through 73.32; from 13.1 through 63.21
NetScaler Gateway: from 14.1 through 73.32; from 13.1 through 63.21

How to fix

Upgrade to a fixed version: Citrix NetScaler ADC 13.1-63.21, 14.1-73.32; Citrix Netscaler Application Delivery Controller Fips 13.1-37.277; Citrix Netscaler Application Delivery Controller Ndcpp 13.1-37.277; Citrix NetScaler Gateway 13.1-63.21, 14.1-73.32. Check the vendor advisory for mitigations.

In the news

2026-010: Critical Vulnerabilities in Citrix NetScaler ADC and NetScaler Gateway

References

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