Affects widely deployed Citrix NetScaler ADC/Gateway; allows remote HTTP request/response smuggling that can disrupt web traffic, bypass protections and compromise sessions across enterprises.
CVE-2026-88773
HTTP request/response smuggling in Citrix NetScaler ADC/Gateway.
Is CVE-2026-88773 being exploited?
Not confirmed. CVE-2026-88773 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-88773?
CVE-2026-88773 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-88773?
Yes. A fix has been recorded for CVE-2026-88773. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88773 affect?
CVE-2026-88773 affects Citrix NetScaler ADC - versions before 14.1-73.37, Citrix NetScaler ADC - versions before 13.1-64.23, Citrix NetScaler ADC FIPS - versions before 14.1-73.37, Citrix NetScaler ADC NDcPP - versions before 13.1-37.279, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88773?
Apply Citrix updates to fixed versions (>=14.1-73.37/13.1-64.23) or implement mitigations per KB immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote HTTP request/response smuggling enabling cache poisoning, request splitting, WAF bypass, session hijack and information disclosure of proxied services.
Immediate action required