CVE-2026-88771
Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.
- Severity: Critical
- CVSS 9.5
- EPSS 1.08%
- On CISA KEV
- Weaponized (Metasploit/Nuclei)
- P1 · Patch now
Why P1: on CISA KEV.
Description
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.
CISA Known Exploited Vulnerability
Added 2026-09-27, remediation due 2026-09-30. Ransomware use: Unknown. 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…
Affected products
- Citrix NetScaler Version details not specified by CISA
- citrix netscaler application delivery controller >= 13.1, < 13.1-64.23
- citrix netscaler application delivery controller >= 13.1, < 13.1.37.279
- citrix netscaler application delivery controller >= 13.1, < 13.1.37.279
- citrix netscaler application delivery controller >= 14.1, < 14.1-73.37
- citrix netscaler application delivery controller >= 14.1-66.68, <= 14.1-73.37
- citrix netscaler gateway >= 13.1, < 13.1-64.23
- citrix netscaler gateway >= 14.1, < 14.1-73.37
Weakness
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
References
- NVD record NVD
- CVE Program record CVE Program
- Reference NVD
- Reference NVD
- GitHub security advisory GitHub
- CISA KEV catalog CISA