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Critical Citrix NetScaler auth bypass now leveraged in attacks

CVE-2026-19490

September 4, 2026 · BleepingComputer · Severity: CRITICAL

This article reports that a critical Citrix NetScaler authentication bypass vulnerability is now being exploited in attacks. The flaw allows attackers to bypass authentication and gain access to NetScaler appliances. 📌 **Analyst Note:** Citrix NetScaler is a common gateway; exploitation could lead to network compromise. Administrators should prioritize patching and monitor for anomalous authentication attempts.

Key Takeaways

  • Attackers are now actively exploiting a critical-severity Citrix NetScaler authentication bypass flaw tracked as CVE-2026-19490 in real-world attacks.
  • The vulnerability was identified by vulnerability intelligence company Previdian and allows attackers to bypass authentication on NetScaler appliances.
  • Organizations using Citrix NetScaler should apply available patches immediately to prevent unauthorized access and potential network compromise.
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