CVE-2026-88771: Inside the Exploitation of a Critical NetScaler RCE Vulnerability

    Tuesday, October 20, 2026 In: Threat Research Print

    Date: 10/20/2026

    Severity: High

    Summary

    CVE-2026-88771 is a critical, unauthenticated remote code execution (RCE) vulnerability affecting Citrix NetScaler ADC and NetScaler Gateway, rated CVSS 9.8 (v3.1) and 9.5 (v4.0). Active exploitation involves access-log poisoning, pre-authentication command execution, appliance fingerprinting, and attempts to deploy multiple web shells, with some activity delivering a FreeBSD x64 implant. Organizations should urgently upgrade to the fixed Citrix releases, preserve forensic evidence, isolate potentially compromised appliances, and investigate systems for signs of exploitation.

    Indicators of Compromise (IOC) List 

    IP Address

    45.153.212.101

    46.233.40.20

    46.236.167.143

    46.33.33.95

    49.150.197.119

    78.190.152.64

    81.10.79.197

    82.167.14.7

    95.105.74.172

    100.38.125.66

    102.213.132.123

    102.222.146.45

    103.181.212.245

    103.197.249.161

    103.83.146.100

    111.92.128.89

    114.145.49.215

    120.244.160.182

    125.62.88.26

    130.12.182.7

    154.183.158.198

    154.241.254.9

    174.60.63.37

    177.52.203.23

    183.63.88.227

    190.117.56.56

    195.62.37.119

    207.48.184.10

    Gurucul Threat Detection and Incident Response (TDIR) Queries for Detection  

    Detection Query 1 :

    dstipaddress IN ("100.38.125.66","114.145.49.215","46.233.40.20","125.62.88.26","95.105.74.172","111.92.128.89","102.222.146.45","82.167.14.7","49.150.197.119","195.62.37.119","81.10.79.197","103.181.212.245","103.197.249.161","207.48.184.10","174.60.63.37","154.241.254.9","78.190.152.64","120.244.160.182","46.236.167.143","177.52.203.23","183.63.88.227","154.183.158.198","45.153.212.101","103.83.146.100","190.117.56.56","102.213.132.123","130.12.182.7","46.33.33.95") or srcipaddress IN ("100.38.125.66","114.145.49.215","46.233.40.20","125.62.88.26","95.105.74.172","111.92.128.89","102.222.146.45","82.167.14.7","49.150.197.119","195.62.37.119","81.10.79.197","103.181.212.245","103.197.249.161","207.48.184.10","174.60.63.37","154.241.254.9","78.190.152.64","120.244.160.182","46.236.167.143","177.52.203.23","183.63.88.227","154.183.158.198","45.153.212.101","103.83.146.100","190.117.56.56","102.213.132.123","130.12.182.7","46.33.33.95")

    Reference:    

    Critical Citrix NetScaler RCE Vulnerability (CVE-2026-88771) Under Active Exploitation                                                         


    Tags

    VulnerabilityCVE-2026ExploitationRCEWebShell

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