Citrix ADC/Gateway up to 13.1-64.22 input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$5k-$25k1.47-

Summaryinfo

A vulnerability described as very critical has been identified in Citrix ADC and Gateway up to 13.1-64.22. The impacted element is an unknown function. Such manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2026-88771. The attack can be launched remotely. Moreover, an exploit is present. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Citrix ADC and Gateway up to 13.1-64.22. It has been rated as very critical. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at support.citrix.com. This vulnerability is handled as CVE-2026-88771 since 09/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but an exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/28/2026).

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 350844 (NetScaler ADC and NetScaler Gateway 13.1 < 13.1-64.23 / 14.1 < 14.1-73.37 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. This issue was added on 09/27/2026 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 09/30/2026:

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 BO

Upgrading to version 13.1-64.23, 13.1.37.279 FIPS and NDcPP, 14.1-73.37 or 14.1-73.37 FIPS eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (350844) and EUVD (EUVD-2026-87958). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Attacked
KEV Added: 🔒
KEV Due: 🔒
KEV Remediation: 🔒
KEV Ransomware: 🔒
KEV Notice: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 350844
Nessus Name: NetScaler ADC and NetScaler Gateway 13.1 < 13.1-64.23 / 14.1 < 14.1-73.37 Multiple Vulnerabilities

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: ADC/Gateway 13.1-64.23/13.1.37.279 FIPS and NDcPP/14.1-73.37/14.1-73.37 FIPS

Timelineinfo

09/10/2026 CVE reserved
09/27/2026 +17 days Advisory disclosed
09/27/2026 +0 days VulDB entry created
09/28/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: citrix.com

Advisory: support.citrix.com
Status: Confirmed

CVE: CVE-2026-88771 (🔒)
GCVE (CVE): GCVE-0-2026-88771
GCVE (VulDB): GCVE-100-410912
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/27/2026 18:32
Updated: 09/28/2026 01:44
Changes: 09/27/2026 18:32 (66), 09/28/2026 01:15 (11), 09/28/2026 01:24 (1), 09/28/2026 01:44 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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