Hackers exploit Citrix NetScaler zero-day to deploy web shells

Cybersecurity researchers have revealed that attackers are actively exploiting the Citrix NetScaler CVE-2026-88772 zero-day vulnerability to breach corporate systems. The security flaw allows malicious actors to gain unauthorized access and execute commands.

During the campaign, the threat actors deployed custom web shells and tunneling malware, achieved root access, stole credentials, and lateralized their movement deeper into internal networks.

According to BleepingComputer, these sophisticated attacks pose a severe risk to enterprise security, as zero-day vulnerabilities are weaponized before patches become widely available.

For organizations and IT administrators, this incident serves as an urgent reminder to audit network gateways and verify the security posture of all Citrix deployments.

Experts advise applying the latest security updates immediately and implementing rigorous network monitoring to detect and block unauthorized access attempts promptly.