{"schema":"threatline.record/2","record":{"id":"CVE-2026-19490","aliases":[],"summary":"Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability","details":"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.","categories":["Network & edge"],"product":"NetScaler","vendor":"Citrix","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-19490","source_modified_at":"2026-10-07T18:01:17.320Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"ADC","vendor":"NetScaler","versions":[{"lessThanOrEqual":"73.32","status":"affected","version":"14.1","versionType":"patch"},{"lessThanOrEqual":"63.21","status":"affected","version":"13.1","versionType":"patch"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-19490","source_modified_at":"2026-10-07T18:01:17.320Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Gateway","vendor":"NetScaler","versions":[{"lessThanOrEqual":"73.32","status":"affected","version":"14.1","versionType":"patch"},{"lessThanOrEqual":"63.21","status":"affected","version":"13.1","versionType":"patch"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":9.3,"severity":"Critical","kev":{"listed":true,"date_added":"2026-09-09","due_date":"2026-09-12","required_action":"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.","ransomware_campaign_use":"Unknown","forensic_triage":true},"epss":{"probability":0.23158,"percentile":0.97767,"score_date":"2026-10-23"},"published_at":"2026-08-19T12:54:39.730Z","modified_at":"2026-10-07T18:01:17.320Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-19490","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T18:01:17.320Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-19490","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","EPSS"],"references":[{"url":"https://support.citrix.com/external/article/CTX696939/netscaler-adc-and-netscaler-gateway-secu.html","source":"CISA KEV"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19490","source":"CISA KEV"},{"source":"CVE List","url":"https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939"},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-19490","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"total","assessed_at":"2026-09-10T03:55:17.447903Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-07T18:01:17.320Z","content_hash":"ee4f702e77a92206fe2440c5fca9c11c07bd0c4133ffe95c190211d9be591a01"}}