Citrix warns admins to patch new NetScaler RCE flaw immediately
Citrix has warned IT administrators to patch systems immediately against a new critical vulnerability affecting NetScaler ADC networking appliances and NetScaler Gateway secure remote access solutions.
Excerpt from the primary source: BleepingComputer
Who is affected
Enterprises
Affected technology: NetScaler ADC / Gateway
What you should do · Patch
Apply the vendor's security update for NetScaler ADC / Gateway. Check the linked advisory for affected and fixed versions, and put internet-facing systems first.
Automated guidance based on this story's classification. Check the linked advisories for specifics.
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Original reporting
Related
Citrix Urges Immediate Patching of Critical NetScaler Vulnerability
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Apply the vendor's security update for NetScaler ADC / Gateway.
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CISA added CVE-2026-88779 (Citrix NetScaler) to its Known Exploited Vulnerabilities catalog on October 4, 2026, which means there is reliable evidence of exploitation in the wild. Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.
CISA lists this as exploited in the wild. Unpatched NetScaler ADC / Gateway systems are exposed to active attacks now.
Treat this as an emergency.
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