HTTP Request Smuggling Vulnerability in Citrix NetScaler ADC and Gateway
CVE-2026-88773

9.3CRITICAL

Key Information:

Vendor

Citrix Netscaler

Status
Adc
Gateway
Vendor
CVE Published:
27 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-88773?

An HTTP request smuggling vulnerability exists in Citrix NetScaler ADC and Gateway due to inconsistent handling of HTTP requests. This flaw can allow an attacker to exploit the application's behavior when processing requests, potentially leading to unauthorized access or data manipulation. The vulnerability affects several versions of both products, necessitating immediate attention for users operating under the specified versions to mitigate associated risks.

Affected Version(s)

ADC 0 < 14.1-73.37

ADC 0 < 13.1-64.23

ADC 0 < 14.1-73.37 FIPS

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-88773
Created by Fyyre

References

https://support.citrix.com/support-home/kbsearch/article?...

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.