Patch nowWhy this label: EPSS 82%

CVE-2026-88771Citrix NetScaler Improper Input Validation Vulnerability

Product: Citrix NetScaler
Added to CISA KEV: September 27, 2026
Deadline for US federal agencies: September 30, 2026
Known ransomware use: Not known
EPSS, next 30 days: 82%, in the top 1% of scored CVEs (Oct 25, 2026)
Weakness: CWE-119

What CISA says

Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.

What CISA asks you to do

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.

Sources

Also exploited recently

Data from CISA's Known Exploited Vulnerabilities catalog (public domain) and FIRST EPSS, refreshed hourly. Rheono did not find or test this vulnerability; this page summarizes public sources.