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CVE-2026-19490

CRITICAL9.8
CISA KEV

Published 2026-08-19 · Updated 2026-10-07 · Source 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5

Summary

CVE-2026-19490 is a critical-severity (CVSS 9.8) vulnerability in Citrix NetScaler. CISA added it to the Known Exploited Vulnerabilities catalog on September 9, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by September 12, 2026. CISA does not currently list it as used in ransomware campaigns. Citrix has 27 vulnerabilities in the KEV catalog, 7 of them linked to ransomware.

All 27 known-exploited Citrix vulnerabilities →

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-288

CISA Known-Exploited Vulnerability

Product: Citrix — NetScaler

Name: Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability

Date added: 2026-09-09 · Due: 2026-09-12

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.

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