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CVE-2026-88771

Citrix NetScaler Improper Input Validation

9.8 CRITICALActively exploited (CISA KEV)EPSS 1.08%
  1. Published27 Sept 2026
  2. Added to CISA KEV27 Sept 2026
  3. Remediation due30 Sept 2026
Actively exploited (CISA KEV)

Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.

Added to KEV: 27 Sept 2026Federal remediation due: 30 Sept 2026

Description

Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated attacker to execute arbitrary commands.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Citrix NetScaler Application Delivery Controller≥ 13.1 < 13.1-64.23 · ≥ 14.1 < 14.1-73.37 · ≥ 13.1 < 13.1.37.279 · ≥ 14.1-66.68 ≤ 14.1-73.37
Citrix NetScaler Gateway≥ 13.1 < 13.1-64.23 · ≥ 14.1 < 14.1-73.37

Remediation

Fixed in
Citrix NetScaler Application Delivery Controller≥ 13.1-64.23
Citrix NetScaler Gateway≥ 13.1-64.23

References

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Frequently asked

Is CVE-2026-88771 being actively exploited?

Yes. CVE-2026-88771 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 27 Sept 2026.

How severe is CVE-2026-88771?

CVE-2026-88771 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.08% probability of exploitation.

Which products are affected by CVE-2026-88771?

Affected products include Citrix NetScaler Application Delivery Controller, Citrix NetScaler Gateway.

How do I fix CVE-2026-88771?

Upgrade affected software to a fixed version, for example Citrix NetScaler Application Delivery Controller 13.1-64.23, Citrix NetScaler Gateway 13.1-64.23 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-88771 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.