Critical

CISA Says Attackers Are Exploiting Two Critical Citrix NetScaler Flaws Globally

The Hacker News

September 28, 2026 at 7:21 AM

Actively Exploited

Overview

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has flagged two serious vulnerabilities in Citrix NetScaler ADC and Gateway systems that are currently being exploited by attackers. The first vulnerability, identified as CVE-2026-88771, has a CVSS score of 9.5, indicating its severity. This flaw allows unauthenticated attackers to potentially gain unauthorized access. Organizations using these Citrix products should be particularly vigilant, as the vulnerabilities can lead to significant security breaches. CISA's inclusion of these flaws in its Known Exploited Vulnerabilities catalog emphasizes the urgency for affected users to take immediate action to protect their systems.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Citrix NetScaler ADC, Citrix NetScaler Gateway
Action Required: Organizations should apply the latest patches provided by Citrix for both NetScaler ADC and Gateway to mitigate these vulnerabilities.
Timeline: Newly disclosed

Original Article Summary

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Sunday added two critical Citrix NetScaler ADC and Gateway flaws to its Known Exploited Vulnerabilities (KEV) catalog, following reports of active exploitation. The vulnerabilities are listed below - CVE-2026-88771 (CVSS score: 9.5) - An improper input validation vulnerability that could allow an unauthenticated attacker to

Impact

Citrix NetScaler ADC, Citrix NetScaler Gateway

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Organizations should apply the latest patches provided by Citrix for both NetScaler ADC and Gateway to mitigate these vulnerabilities. Regularly updating and reviewing security settings is also recommended.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Vulnerability, Critical.

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