CVE-2026-19490
Authentication Bypass Using an Alternate Path or Channel in Citrix NetScaler. CISA confirmed attackers exploit it and added it to its Known Exploited Vulnerabilities catalog on 9 September 2026.
- Product
- Citrix NetScaler
- Added to CISA's catalog
- Federal fix-by date
- Ransomware
- No known use in ransomware campaigns
- Vendor advisories
- Sources
- CISA’s catalog, NVD entry
CISA’s description.
Citrix NetScaler ADC and NetScaler Gateway contain an authentication-bypass vulnerability involving an alternate path or channel. When the NetScaler appliance is configured as an AAA virtual server or as a Gateway (SSL VPN, ICA Proxy, CVPN, or RDP Proxy), an unauthenticated remote threat actor may be able to bypass authentication.
More from Citrix this year.
- CVE-2026-88779 Improper Restriction of Operations within the Bounds of a Memory Buffer, added
- CVE-2026-88772 Improper Restriction of Operations within the Bounds of a Memory Buffer, added
- CVE-2026-88771 Improper Input Validation, added
- CVE-2026-8452 Improper Restriction of Operations within the Bounds of a Memory Buffer, added
- CVE-2026-3055 Out-of-Bounds Read, added
Every flaw CISA confirmed exploited in the last 30 days is on the exploit watch. This is not security advice. Check the vendor’s advisory before acting. From CISA’s catalog of 4 November 2026.