CVE-2026-88771Known exploitationNetwork attack vector

Unauthenticated command execution via improper input validation

Published Sep 27, 2026 · Updated Sep 27, 2026

Improper input validation in Citrix NetScaler ADC and NetScaler Gateway allows remote attackers to execute arbitrary commands. Citrix has not published the affected component, the accepted input, or the validation operation that mishandles it. Unauthenticated network reachability is sufficient, and successful exploitation grants command execution on the appliance; exploitation on unmitigated deployments has been observed.

CVSS severityUnavailable
Unscored
EPSS probability1.08%
Next 30 days · Oct 19, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Citrix NetScaler ADC and NetScaler Gateway allows remote attackers to execute arbitrary commands. Citrix has not published the affected component, the accepted input, or the validation operation that mishandles it. Unauthenticated network reachability is sufficient, and successful exploitation grants command execution on the appliance; exploitation on unmitigated deployments has been observed.

The record

CVE
CVE-2026-88771
Published
Sep 27, 2026
Updated
Sep 27, 2026
Vendor
Citrix
Product
Citrix ADC
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <13.1.37.279 FIPS and NDcPP
  2. Affected versionversion=0 <13.1-64.23
  3. Affected versionversion=0 <14.1-73.37
  4. Affected versionversion=0 <14.1-73.37 FIPS

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Citrix · Citrix ADCversion=0 <13.1.37.279 FIPS and NDcPP; version=0 <13.1-64.23; version=0 <14.1-73.37; version=0 <14.1-73.37 FIPS
Citrix · Citrix Gatewayversion=0 <13.1-64.23; version=0 <14.1-73.37

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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