Citrix NetScaler vulnerabilities: known CVEs & security history
Citrix · Network / Security · 19 tracked CVEs · 8 actively exploited · updated October 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Citrix NetScaler release lines — 19 in total, with 8 actively exploited in the wild. A CVE here doesn't mean your version is affected — check Citrix NetScaler's current status and the safe version to run.
Known Citrix NetScaler CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2026-88771⚡ exploited | critical | 9.8 | — | 2026 |
| CVE-2026-19490⚡ exploited | critical | 9.8 | 23% | 2026 |
| CVE-2026-8452⚡ exploited | critical | 9.8 | 1% | 2026 |
| CVE-2023-3519⚡ exploited | critical | 9.8 | 100% | 2023 |
| CVE-2023-4966⚡ exploited | critical | 9.4 | 100% | 2023 |
| CVE-2026-88772⚡ exploited | high | 8.1 | — | 2026 |
| CVE-2026-88779⚡ exploited | high | 7.5 | 0% | 2026 |
| CVE-2025-5777⚡ exploited | high | 7.5 | 100% | 2025 |
| CVE-2026-88773 | critical | 10 | 0% | 2026 |
| CVE-2026-88777 | critical | 9.8 | 0% | 2026 |
| CVE-2026-88776 | critical | 9.8 | 0% | 2026 |
| CVE-2026-88775 | critical | 9.8 | 0% | 2026 |
| CVE-2026-8655 | critical | 9.8 | 0% | 2026 |
| CVE-2026-88778 | high | 7.5 | 0% | 2026 |
| CVE-2026-8451 | high | 7.5 | 1% | 2026 |
| CVE-2026-13474 | high | 7.5 | 0% | 2026 |
| CVE-2026-10817 | high | 7.5 | 0% | 2026 |
| CVE-2026-10816 | high | 7.5 | 0% | 2026 |
| CVE-2026-88774 | high | 7.2 | 0% | 2026 |
Is my Citrix NetScaler version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Citrix NetScaler version → · Monitor Citrix NetScaler for new CVEs →
Citrix NetScaler vulnerabilities — frequently asked
How many known vulnerabilities does Citrix NetScaler have?
IsItPatched tracks 19 CVEs for Citrix NetScaler, 8 of which are actively exploited (CISA KEV). 10 are critical-severity and 9 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Citrix NetScaler have any actively-exploited vulnerabilities?
Yes — 8 Citrix NetScaler CVEs are in CISA's Known Exploited Vulnerabilities catalog, meaning they are confirmed exploited in the wild (3 linked to ransomware). Patch these as a priority.
What is the most severe Citrix NetScaler vulnerability?
Among tracked issues, CVE-2026-88771 (CRITICAL, CVSS 9.8), which is actively exploited, ranks highest — a Improper input validation weakness.
Is Citrix NetScaler safe to use?
It depends on the version. The latest supported Citrix NetScaler release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Citrix NetScaler security status · Citrix NetScaler end-of-life · actively-exploited CVEs. Always verify against Citrix's advisories — see our disclaimer.