Citrix NetScaler ADC/Gateway Pre 14.173.37 & 13.164.23 Unauth RCE
CVE-2026-88771 Published on September 27, 2026
A 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.
Known Exploited Vulnerability
This Citrix NetScaler Improper Input Validation Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.
The following remediation steps are recommended / required by September 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 applicab
Vulnerability Analysis
CVE-2026-88771 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Affected Versions
Citrix NetScaler ADC:- Before 14.1-73.37 is affected.
- Before 13.1-64.23 is affected.
- Before 14.1-73.37 FIPS is affected.
- Before 13.1.37.279 FIPS and NDcPP is affected.
- Before 14.1-73.37 is affected.
- Before 13.1-64.23 is affected.