CVE-2026-88771: netscaler gateway — Actively Exploited

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.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Sep 27, 2026 Remediation due: Sep 30, 2026

Weakness Type (CWE)

CWE-20 Improper Input Validation

Affected Products

Vendor	Product	Versions
citrix	netscaler_application_delivery_controller	13.1 — 13.1-64.23
citrix	netscaler_application_delivery_controller	13.1 — 13.1.37.279
citrix	netscaler_application_delivery_controller	13.1 — 13.1.37.279
citrix	netscaler_application_delivery_controller	14.1 — 14.1-73.37
citrix	netscaler_application_delivery_controller	14.1-66.68 — 14.1-73.37
citrix	netscaler_gateway	13.1 — 13.1-64.23
citrix	netscaler_gateway	14.1 — 14.1-73.37

References

Advisories & Patches

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096

Other References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88771

Frequently Asked Questions

What is CVE-2026-88771? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2026-88771? +

CVE-2026-88771 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2026-88771? +

CVE-2026-88771 affects products from citrix, specifically: netscaler_application_delivery_controller, netscaler_gateway. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-88771? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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