Hackers exploit Citrix NetScaler zero-day to deploy web shells
BLUF
Active exploitation of a Citrix NetScaler zero-day is enabling attackers to gain root access and move laterally within victim networks.
NEWS
Security firms have confirmed active attacks leveraging CVE-2026-88772 to deploy custom web shells and tunneling malware on Citrix NetScaler devices. This exploitation allows threat actors to obtain root privileges, exfiltrate credentials, and pivot deeper into internal infrastructure.
Why I Care
This poses a severe risk to any organization running vulnerable Citrix NetScaler instances, as the compromise leads to full administrative control and potential data breaches. The ability to tunnel traffic makes detection difficult while enabling long-term persistence and ransomware deployment.
Next Steps
IT security teams must immediately patch Citrix NetScaler appliances according to vendor advisories and scan for indicators of compromise like web shells. Network administrators should isolate affected systems and review authentication logs for unauthorized access attempts starting today.
Source: BleepingComputer ·