CVE-2026-88771 Citrix NetScaler Improper Input Validation

What is CVE-2026-88771?

CVE-2026-88771 is a critical command injection vulnerability in Citrix NetScaler ADC, published on 27 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-20

Which versions are affected by CVE-2026-88771?

It affects 2 products.

Products include Citrix NetScaler ADC, Citrix Netscaler Gateway.

How do I fix CVE-2026-88771?

No fix has been published for CVE-2026-88771 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 30 Sep 2026.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-88771 being exploited?

Yes. Attackers have exploited CVE-2026-88771 in the wild since at least 27 Sep 2026.

Public exploit code: 1 Metasploit module and 12 proofs of concept on GitHub.

Other vulnerabilities in Citrix NetScaler ADC

• CVE-2023-3519 Citrix NetScaler ADC and NetScaler Gateway Code Injection Exploited Critical 9.8
• CVE-2026-88772 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Exploited Critical 9.5
• CVE-2023-4966 Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Exploited Critical 9.4
• CVE-2026-19490 Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Exploited Critical 9.3
• CVE-2026-3055 Citrix NetScaler Out-of-Bounds Read Exploited Critical 9.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-mx58-p288-86qp.