Citrix reports that CVE-2026-88771 and CVE-2026-88772 were exploited before fixes were available. Both affect NetScaler ADC and Gateway deployments, and upgrading to a patched build does not establish whether an appliance was compromised beforehand. The available indicators may also miss some intrusions. For teams operating exposed NetScaler systems, are you capturing snapshots, packet-engine core dumps, or other forensic evidence before upgrading, or prioritizing an immediate move to the fixed build? What checks are you using afterward to determine whether the appliance is clean?
1 Answer
The practical response seems to be patch as quickly as possible, especially for internet-facing appliances. Many teams probably will not have the downtime or tooling to perform a full forensic capture first, so they upgrade and move on without being certain whether the system was previously accessed. If you can preserve useful evidence without delaying remediation, do that; otherwise, getting onto the fixed build is likely the priority.
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