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Vulnerability record · CVE-2026-88771 · published 27 September 2026

CVE-2026-88771: Citrix NetScaler Improper Input Validation Vulnerability

Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated attacker to execute arbitrary commands.

9.5 CVSS 4.0 Critical CISA KEV since 27 Sep 2026 CWE-20 · Improper input validation Received
9.5CVSS 4.0 base score
—EPSS exploitation probability, 30 days
YesIn CISA KEV, federal fix due in 1 days
0Affected product versions listed by NVD
2References
28 Sep 2026Last modified by NVD

Description

Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated attacker to execute arbitrary commands.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Exploitation in the wild

CISA added CVE-2026-88771 to the Known Exploited Vulnerabilities catalog on 27 September 2026 as "Citrix NetScaler Improper Input Validation Vulnerability". Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. Federal deadline 30 September 2026.

References

LinkTags
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88771

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Source: NIST National Vulnerability Database (record CVE-2026-88771), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.