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2026-010: Critical Vulnerabilities in Citrix NetScaler ADC and NetScaler Gateway

On 19 August 2026, Citrix published a security advisory addressing multiple critical vulnerabilities in NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway).<br> CERT-EU recommends updating affected devices as soon as possible.<br>
CRITICAL
Severity & confidence
Source severitycritical
Platform severitycritical
Confidencehigh
Exploitationunknown
CVSS-
Affected
CountriesEU
Reporting sources (1)
CERT-EU - Security Advisories
Open source โ†—
Timeline & provenance
Published2026-08-21T04:41:04
Last updated2026-10-21T05:52:00
Ingested2026-08-21T04:41:04
FreshnessNEAR-REAL-TIME
Threat typeadvisory
Recommended action
No recommended action published with this item - review the original source.
Next steps
  1. Identify affected systems in your environment.
  2. Apply the vendor patch or mitigation guidance.
  3. Review logs for indicators described in the advisory.
  4. Follow the affected vendor/product to track updates.
Confidence explanation
Reported by a government or cert-grade source (CISA, NCSC, NVD, ENISA, MSRC).
Source type: gov ยท Original: CERT-EU - Security Advisories