Search: CVE-2026-88772

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 Remote Code Execution or Denial of Service

In October 2026, Citrix NetScaler ADC appliances running affected 14.1 builds were compromised through a chain of two vulnerabilities: CVE-2026-88771 and CVE-2026-88779. Attackers achieved root code execution by exploiting a pre-authentication log-poisoning/RCE vulnerability and a SAML-parsing crash. The intrusion involved deploying PHP web shells, modifying system shells, creating cron jobs, and establishing boot hooks for persistence. Additional tools included TCP session managers, HTTP tunnels, and reverse agents for command-and-control. Attackers used a Go-based reconnaissance tool to map internal infrastructure and synchronized implants across appliance pairs to maintain persistence. The campaign exfiltrated NetScaler configurations, historical data, and key material, evolving from initial access to a persistent internal reconnaissance platform.

On August 31, 2026, threat actors exploited two zero-day vulnerabilities in PaperCut MF version 24.0.2, targeting an internet-facing print server in the Education sector. The attackers deployed an in-memory Java loader to establish a web shell, through which they delivered a trojanized Microsoft Copilot binary containing an AdaptixC2 implant. This implant connected to command-and-control infrastructure hosted on Alibaba servers. After a dormant period, the attackers performed reconnaissance and Active Directory enumeration, stole a token from a domain-privileged service account, and moved laterally to a domain controller. On the domain controller, they dumped credentials, enabled Windows Restricted Admin mode for pass-the-hash attacks, and extracted the NTDS.dit database, achieving full domain compromise.