Critical

Hackers exploit Citrix NetScaler zero-day to deploy web shells

BleepingComputer

September 29, 2026 at 6:37 PM

Actively Exploited

CVE Zero-day Exploit Vulnerability Malware

Overview

Cybersecurity experts have reported that attackers are exploiting a zero-day vulnerability in Citrix NetScaler, identified as CVE-2026-88772. This vulnerability allows hackers to deploy custom web shells and tunneling malware, which can lead to root access on affected systems. Once inside, attackers can steal credentials and move laterally across internal networks, posing a significant risk to organizations that rely on Citrix products. This incident is particularly concerning given the potential for widespread credential theft and internal network compromise. Organizations using Citrix NetScaler should take immediate action to assess their security posture and apply any available patches or mitigations.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Citrix NetScaler, specifically affected versions related to CVE-2026-88772.
Action Required: Organizations should immediately apply any patches provided by Citrix for CVE-2026-88772.
Timeline: Newly disclosed

Original Article Summary

Cybersecurity firms say attackers exploited the Citrix NetScaler CVE-2026-88772 zero-day to deploy custom web shells and tunneling malware, gain root access, steal credentials, and spread into internal networks. [...]

Impact

Citrix NetScaler, specifically affected versions related to CVE-2026-88772.

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 immediately apply any patches provided by Citrix for CVE-2026-88772. Additionally, they should review and strengthen their network segmentation and access controls to limit potential lateral movement by attackers. Regularly updating credentials and monitoring for suspicious activity on internal networks are 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, Zero-day, Exploit, and 2 more.

Read Original Article

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