Affects widely used Citrix NetScaler ADC/Gateway; predictable tokens can enable large-scale session hijack or auth bypass across enterprises.
CVE-2026-88778
Predictable token values in Citrix NetScaler ADC/Gateway enabling token/session prediction.
Is CVE-2026-88778 being exploited?
Not confirmed. CVE-2026-88778 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-2026-88778?
CVE-2026-88778 is rated High with a CVSS score of 8.8. 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-2026-88778?
Yes. A fix has been recorded for CVE-2026-88778. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88778 affect?
CVE-2026-88778 affects Citrix NetScaler ADC before 14.1-73.37, Citrix NetScaler ADC before 13.1-64.23, Citrix NetScaler ADC FIPS before 14.1-73.37 and 13.1.37.279, Citrix NetScaler Gateway before 14.1-73.37, and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88778?
Apply vendor updates to fixed versions, rotate credentials, and monitor session/auth logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attackers can predict authentication/session values to impersonate users, bypass auth, and gain unauthorized access to applications.
Immediate action required