# CVE-2026-88771: Citrix NetScaler ADC and Gateway improper input validation

Source: https://junglewise.ai/threats/cve-2026-88771-improper-input-validation-vulnerability-in-citrix-netscaler-adc  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-27. Updated: 2026-09-27  
License: CC BY 4.0 with a link back

CVE-2026-88771 · Severity: critical · Exploited in the wild · Published 2026-09-27

Citrix NetScaler ADC and NetScaler Gateway are network appliances that manage traffic and application access for enterprises. An improper input validation flaw allows unauthenticated attackers to execute arbitrary commands on affected systems, potentially compromising network infrastructure and sensitive data.

Technologies: [Citrix NetScaler](https://junglewise.ai/threats/technologies/netscaler), [Citrix NetScaler ADC](https://junglewise.ai/threats/technologies/netscaler-adc), [Citrix NetScaler Gateway](https://junglewise.ai/threats/technologies/gateway). Vendors: [Citrix](https://junglewise.ai/threats/vendors/citrix).

## Quick answers

**Is CVE-2026-88771 exploited in the wild?** Yes. CVE-2026-88771 is known to be exploited in the wild, first recorded on 27 September 2026. Treat it as urgent.

**How severe is CVE-2026-88771?** Critical severity, published 27 September 2026.

**Which products and versions are affected?** Citrix NetScaler ADC before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, before 13.1.37.279 FIPS and NDcPP; Citrix NetScaler Gateway before 14.1-73.37, before 13.1-64.23.

**Is there a fix for CVE-2026-88771?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-88771 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-88771?** Check whether you run Citrix NetScaler, Citrix NetScaler ADC or Citrix NetScaler Gateway at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an improper input validation issue in Citrix NetScaler ADC and Gateway that permits unauthenticated remote code execution. An attacker can exploit this without authentication by sending specially crafted input to execute arbitrary commands on the appliance, gaining full system compromise.

## Affected products

- Citrix NetScaler ADC before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, before 13.1.37.279 FIPS and NDcPP
- Citrix NetScaler Gateway before 14.1-73.37, before 13.1-64.23

## Timeline

- 2026-09-27: disclosed

## References

- [https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096](https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096)

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