October 8, 2026 · 1 min read
CVE-2026-88779: Citrix NetScaler exploitation alert
CISA added CVE-2026-88779 to its Known Exploited Vulnerabilities catalog on 2026-10-04. Review affected Citrix NetScaler deployments and vendor mitigation guidance.
CVE-2026-88779: what changed
CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 2026-10-04. Inclusion indicates evidence of exploitation; it does not establish that your own systems have been compromised.
Affected product
Citrix NetScaler. Confirm affected versions against the vendor advisory.
CISA description
Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.
Recommended response
Inventory affected deployments, check vendor guidance for fixes or mitigations, and verify the update was applied. Review available logs and incident-response guidance when exploitation is suspected.
Catalog context
CISA lists a remediation due date of 2026-10-07. Federal directive deadlines have a defined scope; other organizations should prioritize according to their exposure and risk. Ransomware campaign use is listed as unknown; “unknown” does not mean exploitation is absent.
Sources
Automated security brief based on CISA catalog data. Catalog addition date: 2026-10-04.