CVE-2026-19490
CriticalExploitedPublic exploitAuthentication Bypass Using an Alternate Path or Channel in NetScaler ADC and NetScaler Gateway
Published Aug 19, 2026 · Updated Oct 7, 2026
Key Facts
Patch immediately- CVE-2026-19490 is a critical-severity vulnerability (CVSS 9.3 v4) affecting Netscaler Application Delivery Controller (Citrix), Netscaler Gateway (Citrix).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 3, 2026. Public exploit code is available.
- EPSS estimates a 23% probability of exploitation in the next 30 days.
- Fixed versions are available, including Netscaler Application Delivery Controller 13.1-37.277, Netscaler Application Delivery Controller 13.1-63.21, Netscaler Application Delivery Controller 14.1-73.32.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v4
9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
EPSS (30-day exploit likelihood)
23%
Higher than 97.7% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-19490 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Sep 9, 2026 | Sep 12, 2026 | Not reported |
| Industry KEV feed | Sep 3, 2026 | Sep 12, 2026 | Not reported |
| CIRCL KEV | Sep 3, 2026 | Sep 12, 2026 | Not reported |
| ENISA EUVD | Sep 9, 2026 | n/a | Not reported |
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.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Netscaler Application Delivery ControllerCitrix | >= 14.1 | 13.1-63.21 |
| Netscaler GatewayCitrix | >= 14.1 | 13.1-63.21 |
Patched Releases
Netscaler Application Delivery Controller
13.1-37.277, 13.1-63.21, 14.1-73.32
Netscaler Gateway
13.1-63.21, 14.1-73.32
Timeline
Publicly disclosed
Aug 19, 2026
Added to Industry KEV feed
Sep 3, 2026
Added to CIRCL KEV
Sep 3, 2026
Added to CISA KEV
Sep 9, 2026
Added to ENISA EUVD
Sep 9, 2026
Last updated
Oct 7, 2026
Weakness Type
- CWE-288 Authentication Bypass Using an Alternate Path or Channel
References
FAQ
Common Questions.
Vulnerability in NetScaler ADC and NetScaler Gateway.
Affected: Netscaler Application Delivery Controller (Citrix) versions >= 14.1; Netscaler Gateway (Citrix) versions >= 14.1. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 3, 2026.
Yes. It was added on Sep 9, 2026 with a federal remediation due date of Sep 12, 2026.
Public exploit code is available.
Fixed versions are available, including Netscaler Application Delivery Controller 13.1-37.277, Netscaler Application Delivery Controller 13.1-63.21, Netscaler Application Delivery Controller 14.1-73.32.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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