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CVE-2026-19490

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

CRITICAL
9.8
CVSS Score
Published: August 19, 2026 at 12:54 PM UTC
Updated: October 26, 2026 at 01:10 PM UTC
4 products affected across 2 vendorsNetScaler GatewayNetscaler Application Delivery ControllerADC

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Severity
CRITICAL9.8
Exploitation
CISA KEV
Exploit prediction
EPSS 33%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score32.7%

EPSS (Exploit Prediction Scoring System) estimates a 32.7% chance this CVE is exploited in the wild within the next 30 days — higher than 98% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Citrix NetScaler ADC and NetScaler Gateway contain an authentication-bypass vulnerability involving an alternate path or channel. When the NetScaler appliance is configured as an AAA virtual server or as a Gateway (SSL VPN, ICA Proxy, CVPN, or RDP Proxy), an unauthenticated remote threat actor may be able to bypass authentication.

Required Action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Ransomware Use
Unknown
Added to KEV
Sep 9, 2026
Remediation Due
Sep 12, 2026
51 days overdue
Notes
https://support.citrix.com/external/article/CTX696939/netscaler-adc-and-netscaler-gateway-secu.html
BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
https://nvd.nist.gov/vuln/detail/CVE-2026-19490

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Netscaler Application Delivery Controller· Citrix
95%
13.1 ≤ v < 13.1-37.27713.1 ≤ v < 13.1-63.2114.1 ≤ v < 14.1-73.3214.1-66.68 ≤ v ≤ 14.1-73.32
Affected range stops below 13.1-37.277, so it looks safe — our inference, not a vendor statement
Affected range stops below 13.1-63.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.1-73.32, so it looks safe — our inference, not a vendor statement
NetScaler Gateway· Citrix
95%
13.1 ≤ v < 13.1-63.2114.1 ≤ v < 14.1-73.32
Affected range stops below 13.1-63.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.1-73.32, so it looks safe — our inference, not a vendor statement
ADC· Netscaler
90%
13.1 ≤ v ≤ 63.2114.1 ≤ v ≤ 73.3213.114.1
Gateway· Netscaler
90%
13.1 ≤ v ≤ 63.2114.1 ≤ v ≤ 73.3213.114.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-19490

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-288

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