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

As cited

Copy frozen at 2026-10-16 23:07 UTC (site build).

vulnerabilities

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

Citrix disclosed CVE-2026-88771, a critical unauthenticated remote code execution vulnerability in NetScaler ADC and NetScaler Gateway with a CVSS v3.1 score of 9.8, which has been actively exploited worldwide and added to CISA's Known Exploited Vulnerabilities catalog. Zscaler ThreatLabz documented a multi-stage exploitation chain involving HTTP access log poisoning with Base64-encoded payloads, forged authentication logs to trigger command execution, and deployment of web shells and FreeBSD implants across affected appliances. The attack infrastructure overlapped with activity previously linked to CVE-2026-75650 (StyleSmuggler), a template-engine injection flaw in Adobe Commerce and Magento, though this connection does not establish definitive threat actor attribution.

Why it matters: Organizations operating exposed NetScaler ADC or NetScaler Gateway appliances face immediate risk of unauthenticated compromise without patching to Citrix builds 14.1-73.46, 13.1-64.29, or later equivalents; forensic evidence should be preserved before updating, and appliances should be inventoried and isolated from untrusted networks.

Source published

2026-10-16 21:28 UTC

First seen by Cybersecurity Tracker

2026-10-16 22:01 UTC