Citrix NetScaler is widely deployed; this is an unauthenticated RCE (CVSS 9.5) on internet-facing ADC/Gateway appliances and is listed in CISA KEV — high-impact, must be broadly communicated.
CVE-2026-88771
Unauthenticated remote command execution in Citrix NetScaler ADC/Gateway
Is CVE-2026-88771 being exploited?
Not confirmed. CVE-2026-88771 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-88771?
CVE-2026-88771 is rated Critical with a CVSS score of 9.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-88771?
Yes. A fix has been recorded for CVE-2026-88771. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88771 affect?
CVE-2026-88771 affects Citrix NetScaler ADC (versions before 14.1-73.37, before 13.1-64.23; includes FIPS/NDcPP variants), Citrix NetScaler Gateway (versions before 14.1-73.37 and before 13.1-64.23). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88771?
Apply Citrix updates (>=14.1-73.37 or >=13.1-64.23) or apply vendor mitigations; isolate internet-facing appliances.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attackers can execute arbitrary OS commands, fully compromise appliances, intercept traffic, and pivot into networks.
Immediate action required