2026-014 Critical Vulnerabilities in Citrix NetScaler ADC and Gateway — CERT-EU-SA2026-014

Summary

On 27 September 2026, Citrix published a security bulletin addressing 8 vulnerabilities affecting customer-managed Citrix NetScaler ADC and Citrix NetScaler Gateway, among which 2 critical unauthenticated Remote Code Execution (RCE) vulnerabilities. Citrix has confirmed active exploitation of these 2 critical vulnerabilities in the wild. CERT-EU recommends updating affected software and running a compromise…

Timeline

Published by source

2026-09-27

Risk context

• The source data marks this issue as actively exploited; remediation should be prioritized.
• Reported severity or threat level: critical.
• Review exposure for the affected product or family: Security advisory.

Product

Security advisory

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Check logs/telemetry for indicators of compromise and suspicious activity.
• Consider temporary hardening: restrict access, reduce attack surface, and monitor aggressively.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source

Evidence and provenance

Canonical advisory ID

CERT-EU-SA2026-014

Source

CERT-EU

Vendor

CERT-EU

Published by source

2026-09-27

Last source activity

2026-09-27

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.