Citrix Patches NetScaler Zero-Day Vulnerability Exploited in Attacks

Citrix has released emergency security updates to address a newly disclosed vulnerability affecting NetScaler appliances, which has already been actively exploited in zero-day attacks.

Tracked as CVE-2026-88779, the issue is a denial-of-service vulnerability. Security researchers are currently investigating whether attackers can leverage this flaw to achieve remote code execution as well.

Administrators are strongly advised to apply the emergency patches immediately to safeguard their networks from ongoing exploitation attempts.

Given the widespread use of NetScaler infrastructure globally and across regional enterprise networks, swift patch management remains critical for maintaining robust cybersecurity defenses.