Citrix NetScaler Improper Input Validation Vulnerability
This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run NetScaler ADC / Gateway, fix it now.
CISA required action: 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.
US federal civilian agencies must remediate by Sep 30, 2026.
No official fix confirmed yet
Until a fix ships, follow the vendor's mitigations and CISA's required action, limit exposure of affected systems, and watch this record for a patch.
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.
Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.
| Product | Vendor | Source |
|---|---|---|
| NetScaler ADC / Gateway | Citrix (Cloud Software Group) | KEV |
Sources: KEV = CISA Known Exploited Vulnerabilities catalog. Version details have not been published yet.
Developments from the last 30 days, newest first.
CVE-2026-88771 scored CVSS 9.5: Citrix NetScaler, Citrix NetScaler Improper Input Validation Vulnerability
CISA lists this as exploited in the wild. Unpatched NetScaler systems are exposed to active attacks now.
Basis: NIST National Vulnerability Database
CVE-2026-88771 added to CISA KEV: Citrix NetScaler, Citrix NetScaler Improper Input Validation Vulnerability
CISA lists this as exploited in the wild. Unpatched NetScaler systems are exposed to active attacks now.
Basis: CISA Known Exploited Vulnerabilities catalog
CISA lists this as exploited in the wild. Unpatched NetScaler ADC / Gateway systems are exposed to active attacks now.
Treat this as an emergency.
CISA lists this as exploited in the wild. Unpatched NetScaler ADC / Gateway systems are exposed to active attacks now.
Treat this as an emergency.
