CVE-2026-88771
KEV: known exploited SSVC: activeA remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commands
Fetching some sources has been requested. Reload in about a minute to see them.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Attack conditions and impact
Derived from the NVD CVSS 3.1 vectorThis vulnerability may be exploitable over the internet without authentication or user interaction.
| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | N | None |
| User interaction UI | N | None |
| Scope S | U | Unchanged |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
CISA KEV entry
Citrix NetScaler Improper Input Validation Vulnerability — Citrix / NetScaler
Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.
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.
Running the provided IOCs in the NetScaler console may help identify indicators of exploitation. Customers must conduct forensic triage as directed by BOD 26‑04 and follow Citrix’s published guidance for mitigations. For more information, please see: https://community.citrix.com/techzone-blogs/110_security-updates/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve-2026-88771-through-cve-2026-88778 ; https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096 ; https://support.citrix.com/external/article/CTX694799/steps-to-take-if-netscaler-adc-is-suspec.html ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-88772
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5 (Secondary) | 4.0 | 9.5 CRITICAL | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD / [email protected] (Primary) | 3.1 | 9.8 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA / NetScaler | 4.0 | 9.5 CRITICAL | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| Citrix NetScaler | ADC | affected: 0 … < 14.1-73.37 affected: 0 … < 13.1-64.23 affected: 0 … < 14.1-73.37 FIPS affected: 0 … < 13.1.37.279 FIPS and NDcPP default: unaffected |
| Citrix NetScaler | Gateway | affected: 0 … < 14.1-73.37 affected: 0 … < 13.1-64.23 default: unaffected |
NVD CPE (7)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| citrix | netscaler_application_delivery_controller | >= 13.1, < 13.1-64.23 | cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* |
| citrix | netscaler_application_delivery_controller | >= 13.1, < 13.1.37.279 | cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* |
| citrix | netscaler_application_delivery_controller | >= 13.1, < 13.1.37.279 | cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:* |
| citrix | netscaler_application_delivery_controller | >= 14.1, < 14.1-73.37 | cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* |
| citrix | netscaler_application_delivery_controller | >= 14.1-66.68, <= 14.1-73.37 | cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* |
| citrix | netscaler_gateway | >= 13.1, < 13.1-64.23 | cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:* |
| citrix | netscaler_gateway | >= 14.1, < 14.1-73.37 | cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:* |
Linux distribution status
References (2)
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096 NVD, CNA Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88771 NVD, ADP CISA-ADP US Government Resourcegovernment-resource