CVE-2026-88771A remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commands
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.
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.5 | CRITICAL | 4.0NetScaler (CNA) | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
| 9.8 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CISA required action
⚡ Known exploited · remediation due Sep 30, 2026
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Details
- CVE ID
- CVE-2026-88771
- Status
- Analyzed
- Assigner (CNA)
- NetScaler
- Published
- Sep 27, 2026
- Last modified
- 2026-09-29 04:18 UTC
Affected Products
As published by the CNA in the CVE record.
Citrix NetScalerADC4 version ranges
- before 14.1-73.37
- before 13.1-64.23
- before 14.1-73.37 FIPS
- before 13.1.37.279 FIPS and NDcPP
Citrix NetScalerGateway2 version ranges
- before 14.1-73.37
- before 13.1-64.23