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Citrix security advisory (AV26-833)
Serial Number: AV26-833 Date: August 19, 2026 As of August 19, 2026, NetScaler is affected by vulnerabilities in the following products: • NetScaler ADC and NetScaler • Version 13.1 prior to or equal to 13.1-63.21 • Version 14.1 prior to or equal to 14.1-73.32 • NetScaler ADC FIPS • Prior to 14.1-73.32 FIPS • NetScaler ADC FIPS and NDcPP • Prior to 13.1-37.277 The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available. • NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19489 and CVE-2026-19490 • Citrix Security Advisories Citrix security advisory (AV26-833) - Canadian Centre for Cyber Security
Critical Citrix NetScaler Flaw Lets Remote Attackers Bypass Authentication Without Credentials
Cloud Software Group has issued a critical security bulletin warning customers of two serious vulnerabilities affecting NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway). Tracked as CVE-2026-19489 and CVE-2026-19490, the flaws could allow attackers to trigger denial-of-service conditions or bypass authentication entirely on unpatched appliances, putting enterprise remote access infrastructure at significant risk. Critical Citrix NetScaler Vulnerability The more severe of the two, CVE-2026-19490, carries a CVSS v4. 0 base score of 9. 3 and is classified under CWE-288, Authentication Bypass Using an Alternate Path. This flaw allows an attacker to circumvent authentication controls on NetScaler appliances configured as a Gateway for SSL VPN, ICA Proxy, CVPN, or RDP Proxy, or as an AAA virtual server.
CVE-2026-19489 - NetScaler ADC and NetScaler Gateway Information Disclosure Vulnerability
CVE ID : CVE-2026-19489 Published : Aug. 19, 2026, 12:45 p. m. • 23 minutes ago 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. Severity: 8.8 • HIGH Visit the link for more details, such as CVSS details, affected products, timeline, and more...
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