Citrix urges urgent NetScaler patching for new authentication bypass flaw

Citrix is urging customers to patch two new NetScaler vulnerabilities after a recent wave of in-the-wild attacks against other NetScaler flaws highlighted the risk of delaying updates. CVE-2026-19490 can enable unauthenticated authentication bypass on certain Gateway and AAA virtual server configurations, while CVE-2026-19489 can cause denial-of-service conditions. Source

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