Citrix issued an urgent security warning on August 20, 2026, regarding two vulnerabilities affecting NetScaler Gateway and NetScaler ADC networking appliances, including at least one critical unauthenticated flaw. The company urged administrators to patch systems immediately.
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Citrix has warned customers to immediately secure their systems against two vulnerabilities affecting NetScaler Gateway secure remote access solutions and NetScaler ADC networking appliances. [...]
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⚠️ Threat Notice: Citrix NetScaler ADC and NetScaler Gateway Vulnerabilities ⚠️ Citrix disclosed two vulnerabilities affecting NetScaler ADC and Gateway appliances, including a critical unauthenticated authentication bypass that can allow remote attackers to access protected resources without valid credentials. These have not been reported to be actively exploited at the time of writing. Sources: