Organizations using Citrix NetScaler should apply the latest firmware updates as released by Citrix. Monitor official Citrix security advisories for CVE-2026-19490. If immediate patching is not possible, consider temporary network segmentation or access controls to limit exposure of NetScaler management interfaces. Ensure all NetScaler deployments are running the most recent supported software versions.
Quick answers
What is CVE-2026-19490?
Organizations using Citrix NetScaler should apply the latest firmware updates as released by Citrix. Monitor official Citrix security advisories for CVE-2026-19490. If immediate patching is not possible, consider temporary network segmentation or access controls to limit exposure of NetScaler management interfaces. Ensure all NetScaler deployments are running the most recent supported software versions.
How severe is CVE-2026-19490?
critical
Is CVE-2026-19490 known to be exploited?
It is not marked known-exploited in this record.
How should CVE-2026-19490 be mitigated?
Organizations using Citrix NetScaler should apply the latest firmware updates as released by Citrix. Monitor official Citrix security advisories for CVE-2026-19490. If immediate patching is not possible, consider temporary network segmentation or access controls to limit exposure of NetScaler management interfaces. Ensure all NetScaler deployments are running the most recent supported software versions.
CVSS
—
Vendor
Citrix
Published
Sep 30, 2026 · 08:05
Patch
Unknown / not confirmed
Affected products
NetScaler
Mitigation
Organizations using Citrix NetScaler should apply the latest firmware updates as released by Citrix. Monitor official Citrix security advisories for CVE-2026-19490. If immediate patching is not possible, consider temporary network segmentation or access controls to limit exposure of NetScaler management interfaces. Ensure all NetScaler deployments are running the most recent supported software versions.
Security researchers report that a critical-severity authentication bypass vulnerability in Citrix NetScaler appliances is being exploited in the wild. The flaw, tracked as CVE-2026-19490, allows unauthenticated remote attackers to circumvent authentication protections on affected appliances. Exploitation began being reported around early September 2026. The vulnerability impacts NetScaler deployments globally, particularly those used for application delivery and load balancing. Citrix has not yet disclosed full technical details, but organizations are urged to apply the latest firmware updates and monitor official advisories.
