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CVE-2026-19490

critical

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.

References

https://www.databreachtoday.com/hackers-hit-netscaler-zero-days-before-citrix-patched-a-32959

https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-exploited-citrix-flaws-by-wednesday/

https://thehackernews.com/2026/09/cisa-flags-exploited-cisco-citrix.html

https://securityaffairs.com/198850/security/u-s-cisa-adds-cisco-google-chromium-v8-fortinet-and-citrix-netscaler-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/09/09/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://securityaffairs.com/199873/security/citrix-confirmed-two-new-netscaler-flaws-exploited-as-zero-day.html

https://www.bleepingcomputer.com/news/security/cisa-hackers-now-exploiting-citrix-netscaler-rce-flaw-in-attacks/

https://www.helpnetsecurity.com/2026/08/21/citrix-netscaler-gateway-cve-2026-19490/

https://www.securityweek.com/exploitation-expected-for-critical-authentication-bypass-patched-in-citrix-netscaler/

https://www.bleepingcomputer.com/news/security/citrix-urges-admins-to-patch-new-netscaler-flaws-as-soon-as-possible/

https://thehackernews.com/2026/08/critical-netscaler-flaw-can-bypass.html

https://github.com/completetech-security/netscaler-cve-2026-19490-check

https://github.com/CompleTetech-Security/netscaler-cve-2026-19490-check

https://github.com/redrabbitdevs/CVE-Dashboard

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-19490

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-62395

Details

Source: Mitre, NVD

Published: 2026-08-19

Updated: 2026-10-26

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 9.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

Severity: Critical

EPSS

EPSS: 0.33262

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest