CVE-2026-19490 Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel
Attackers can bypass authentication in NetScaler ADC and Gateway, potentially gaining unauthorized access to the network infrastructure.
- Exploited in the wild
- Since 9 Sep 2026
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19490?
CVE-2026-19490 is a critical authentication bypass vulnerability in NetScaler ADC, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Vulnerability in NetScaler ADC and NetScaler Gateway.
This issue affects ADC: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.
Weakness: CWE-288
Which versions are affected by CVE-2026-19490?
It affects 2 products.
Products include Citrix NetScaler ADC, Citrix Netscaler Gateway.
How do I fix CVE-2026-19490?
No fix has been published for CVE-2026-19490 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 12 Sep 2026.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-19490 being exploited?
Yes. Attackers have exploited CVE-2026-19490 in the wild since at least 9 Sep 2026.
Public exploit code: 3 proofs of concept on GitHub.
Other vulnerabilities in 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-2026-3055 Citrix NetScaler Out-of-Bounds Read
Sources
Also known as GHSA-7c6h-rhhv-wm8r.