MajorExploited now Active exploitation

CVE-2026-88771: Citrix NetScaler Improper Input Validation Vulnerability

CISA KEV · officialPublished Sep 27, 2026Risk 77/100

Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands. Vendor: Citrix — NetScaler 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. Due: 2026-09-30

Recommended 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.

CISA remediation due: 2026-09-30

Technical details

Vendor: Citrix
Product: NetScaler
Exploitation: active
Evidence: official

Evidence and sources

This record is attributed to CISA KEV. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.

Open primary source