Snapshot of public data from 30 Oct 2026, 10:41:14. This data is not updated until the API is deployed.

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CVE-2026-88771

Citrix NetScaler Improper Input Validation Vulnerability

UrgentCVSS 9.5 v4.0Exploited

Why this priority

?

Generic watch priority computed by public, versioned rules. It does not know your assets. See the glossary

  • Présent dans le catalogue CISA KEV (exploitation confirmée)

Description

Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.

Affected products

VendorProductVersions
Citrix NetScalerADC
  • 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 NetScalerGateway
  • before 14.1-73.37
  • before 13.1-64.23
CitrixNetScalerAll versions

Revision history

  1. Revision 2

    Update : Affected versions changed

  2. Revision 1

    New record

Qualification

CVSS severity
?

Technical severity score between 0 and 10, with its version (3.1, 4.0). See the glossary

9.5 CRITICAL CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
KEV catalog
?

CISA catalog of vulnerabilities with confirmed exploitation. Absence from the catalog does not prove absence of exploitation. See the glossary

Listed
Exploitation
Confirmed
EPSS probability
?

Probability, between 0 and 1, that a vulnerability is exploited in the next 30 days, published daily by FIRST. Always dated. See the glossary

Unknown
Confidence
?

Quality of the sources behind the record. It is not a risk score. See the glossary

High

Priority rules, version 1

CISA KEV catalog

Added on
27 September 2026
Federal due date
30 September 2026
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.
Ransomware use
Unknown

Record

Published on
27 September 2026
Weaknesses (CWE)
CWE-119, CWE-20

Sources

References

CVE-2026-88771 Citrix NetScaler Improper Input Validation Vulnerability · Avanguard TACTIC