{"id":"CVE-2026-19490","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-19490","generatedAt":"2026-10-28T11:56:28.864Z","title":"Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability","description":"Vulnerability in NetScaler ADC and NetScaler Gateway.\n\nThis 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.","published":"2026-08-19T13:17:45.000Z","lastModified":"2026-10-26T13:10:00.000Z","status":"Analyzed","sourceIdentifier":"50a63c94-1ea7-4568-8c11-eb79e7c5a2b5","cvss":{"version":"4.0","score":9.3,"severity":"CRITICAL","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-288"],"affected":["citrix/netscaler application delivery controller","citrix/netscaler gateway"],"epss":{"score":0.32653,"percentile":0.98333,"date":"2026-10-27","history":[{"date":"2026-09-24","score":0.0701,"percentile":0.93929},{"date":"2026-10-02","score":0.23158,"percentile":0.97707},{"date":"2026-10-25","score":0.32653,"percentile":0.98329}]},"kev":{"listed":true,"dateAdded":"2026-09-09","dueDate":"2026-09-12","knownRansomwareCampaignUse":"Unknown","notes":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.\nhttps://support.citrix.com/external/article/CTX696939/netscaler-adc-and-netscaler-gateway-secu.html ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-19490"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 12 September 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-25T00:00:00.000Z","detail":{"to":0.32653,"from":0.23158,"percentile":0.98329},"summary":"EPSS moved from 23.2% to 32.7% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-10-02T00:00:00.000Z","detail":{"to":0.23158,"from":0.0797,"percentile":0.97707},"summary":"EPSS moved from 8.0% to 23.2% probability of exploitation in the next thirty days."}],"references":[{"url":"https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939","tags":["Vendor Advisory"],"source":"50a63c94-1ea7-4568-8c11-eb79e7c5a2b5"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-19490","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-19490","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}