CVE-2026-88771
Citrix NetScaler Improper Input Validation Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-09-27. Federal due date: 2026-09-30.
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.
Impact
Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Citrix | Netscaler Application Delivery Controller | from 13.1 before 13.1-64.23 from 13.1 before 13.1.37.279 from 14.1 before 14.1-73.37 from 14.1-66.68 through 14.1-73.37 |
| Citrix | Netscaler Gateway | from 13.1 before 13.1-64.23 from 14.1 before 14.1-73.37 |