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CVE-2026-19490 affects NetScaler ADC and NetScaler Gateway.
It is an authentication bypass using an alternate path or channel.
The weakness is CWE-288.
CWE-288 occurs when authentication is enforced on one path.
Another path reaches the same protected function without that check.
The alternate path or channel can be a different URL route.
It can be a different management endpoint.
It can be a different protocol handler.
It can be a different backend channel.
NetScaler ADC and Gateway expose management and application delivery functions.
Authentication normally protects administrative and gateway access.
If a parallel path lacks the same authentication gate, access may be granted.
The vulnerable ranges are listed for ADC and Gateway.
ADC is affected from 14.1 through 73.32.
ADC is affected from 13.1 through 63.21.
Gateway is affected from 14.1 through 73.32.
Gateway is affected from 13.1 through 63.21.
Known affected configurations include NetScaler ADC FIPS.
Known affected configurations include NetScaler ADC NDCPP.
Known affected configurations include NetScaler Gateway.
CISA added the issue to the Known Exploited Vulnerabilities Catalog.
CISA identifies it as Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability.
CISA added it on September 09, 2026.
CISA due date is September 12, 2026.
Required action is to apply mitigations per vendor instructions.
Required action includes CISA BOD 26-04 guidance.
Required action includes forensics triage requirements.
The issue can allow bypass of authentication controls.
Bypass can expose protected resources.
Bypass can expose management functions.
Bypass can expose gateway functions.
Because exploitation is known, priority is urgent.
Patch or mitigate to fixed NetScaler versions.
DailyCVE Form:
Platform: NetScaler ADC Gateway
Version: 14.1 13.1 affected
Vulnerability : Authentication Bypass CWE-288
Severity: Not Provided
date: Aug 19 2026
Prediction: September 12 2026
What Undercode Say:
Analytics:
curl -s "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-19490" | jq . curl -s "https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json" | jq '.vulnerabilities[] | select(.cveID=="CVE-2026-19490")' ssh nsadmin@$NETSCALER 'show ns version' ssh nsadmin@$NETSCALER 'show ns runningConfig | grep -E "13\.1|14\.1"'
import requests
cve = requests.get("https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-19490").json()
print(cve["vulnerabilities"][bash]["cve"]["id"])
Exploit: (Educational Purposes!)
No exploit code in .
Use authorized lab only.
Validate affected version ranges.
Do not target production systems.
Follow CISA forensics triage.
Protection: from this CVE
Apply vendor advisory.
Upgrade ADC beyond 73.32.
Upgrade ADC beyond 63.21.
Upgrade Gateway beyond 73.32.
Upgrade Gateway beyond 63.21.
Follow CISA BOD 26-04.
Apply mitigations if patch unavailable.
Discontinue if mitigations unavailable.
Monitor KEV catalog.
Impact:
Authentication bypass.
Known exploited.
Protected resources exposed.
Management access risk.
Gateway access risk.
CISA due date urgent.
Forensics triage required.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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