CVE-2026-88773
HTTP Request Smuggling
Description
Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') 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 and NDcPP; Gateway: before 14.1-73.37 FIPS and before 13.1-64.23.
INFO
Published Date :
Sept. 27, 2026, 5:16 p.m.
Last Modified :
Sept. 29, 2026, 4:17 p.m.
Remotely Exploit :
Yes !
Source :
50a63c94-1ea7-4568-8c11-eb79e7c5a2b5
Affected Products
The following products are affected by CVE-2026-88773
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5 | ||||
| CVSS 4.0 | CRITICAL | 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5 |
Solution
- Update Citrix NetScaler ADC to version 14.1-73.37 or later.
- Update Citrix NetScaler ADC to version 13.1-64.23 or later.
- Update Citrix NetScaler Gateway to version 14.1-73.37 or later.
- Update Citrix NetScaler Gateway to version 13.1-64.23 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-88773.
| URL | Resource |
|---|---|
| https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-88773 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-88773
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-88773 vulnerability anywhere in the article.
-
TheCyberThrone
Citrix NetScaler Zero-Days Exploited in the Wild: CISA Adds Them to KEV
Executive SummaryCitrix has confirmed that two NetScaler ADC and NetScaler Gateway zero-day vulnerabilities — CVE-2026-88771 and CVE-2026-88772 — are being exploited in the wild.Both are rated CVSS 9. ... Read more
The following table lists the changes that have been made to the
CVE-2026-88773 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 29, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-88773', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-29T15:17:32.077580Z'} -
Initial Analysis by [email protected]
Sep. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* versions from (including) 13.1 up to (excluding) 13.1-64.23 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* versions from (including) 14.1 up to (excluding) 14.1-73.37 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* versions from (including) 13.1 up to (excluding) 13.1.37.279 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* versions from (including) 14.1-66.68 up to (including) 14.1-73.37 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:* versions from (including) 13.1 up to (excluding) 13.1.37.279 *cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:* versions from (including) 13.1 up to (excluding) 13.1-64.23 *cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:* versions from (including) 14.1 up to (excluding) 14.1-73.37 Added Reference Type NetScaler: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096 Types: Vendor Advisory -
CVE Translated by [email protected]
Sep. 28, 2026
Action Type Old Value New Value Added Translation Title: ADC y Gateway de Citrix NetScaler, Description: Vulnerabilidad de interpretación inconsistente de solicitudes HTTP ('contrabando de solicitudes/respuestas HTTP') en Citrix NetScaler ADC y Citrix NetScaler Gateway. Este problema afecta a ADC: antes de 14.1-73.37, antes de 13.1-64.23, antes de 14.1-73.37 FIPS, y antes de 13.1-37.279 y NDcPP; Gateway: antes de 14.1-73.37 FIPS y antes de 13.1-64.23. -
New CVE Received by 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5
Sep. 27, 2026
Action Type Old Value New Value Added Description Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') 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 and NDcPP; Gateway: before 14.1-73.37 FIPS and before 13.1-64.23. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N/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 Added CWE CWE-444 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/88xxx/CVE-2026-88773.json">CVE-2026-88773</a> Added Reference https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096