CVE-2026-88773 HTTP Request Smuggling
Attackers can exploit HTTP request smuggling in Citrix NetScaler ADC and Gateway to bypass security controls or access sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-88773?
CVE-2026-88773 is a critical vulnerability in Citrix NetScaler ADC, published on 27 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-444
Which versions are affected by CVE-2026-88773?
It affects 2 products.
Products include Citrix NetScaler ADC, Citrix Netscaler Gateway.
How do I fix CVE-2026-88773?
No fix has been published for CVE-2026-88773 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-88773 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88773 exists.
Public exploit code: 1 Metasploit module and 2 proofs of concept on GitHub.
Other vulnerabilities in Citrix NetScaler ADC
- CVE-2023-3519 Citrix NetScaler ADC and NetScaler Gateway Code Injection
- CVE-2026-88771 Citrix NetScaler Improper Input Validation
- CVE-2026-88772 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer
- CVE-2023-4966 Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow
- CVE-2026-19490 Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel
Sources
Also known as GHSA-9x87-2c36-ffjf.