Affects widely deployed Citrix NetScaler ADC/Gateway; high-severity network-facing flaw can impact enterprise access and services.
CVE-2026-19489
High-severity vulnerability in Citrix NetScaler ADC/Gateway affecting many versions.
Is CVE-2026-19489 being exploited?
Not confirmed. CVE-2026-19489 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. EPSS currently estimates a 0.39% probability of exploitation in the next 30 days.
How severe is CVE-2026-19489?
CVE-2026-19489 is rated High with a CVSS score of 8.8. 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-2026-19489?
Not known from our data. No patch reference has been recorded for CVE-2026-19489, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-19489 affect?
CVE-2026-19489 affects Citrix NetScaler ADC (13.1 through 63.21; 14.1 through 73.32), Citrix NetScaler Gateway (13.1 through 63.21; 14.1 through 73.32). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-19489?
Isolate/segment appliances, restrict access, apply vendor patch or workaround as soon as available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attackers can execute arbitrary commands or gain remote code execution via crafted network requests, enabling takeover, data theft, or service disruption.
Immediate action required
- affected>= 14.1 and <= 73.32
- affected>= 13.1 and <= 63.21
- affected>= 14.1 and <= 73.32
- affected>= 13.1 and <= 63.21
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.