CVE-2026-19490 (GCVE-0-2026-19490)

Vulnerability from cvelistv5 – Published: 2026-08-19 12:54 – Updated: 2026-09-10 03:55
VLAI CISA Previdian
Title
NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490
Summary
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.
Severity
9.3 (Critical)
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
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 00:00 UTC
CWE
  • CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Assigner
References
Impacted products
Vendor Product Version CPE status
NetScaler ADC Affected: 14.1 , ≤ 73.32 (patch)
Affected: 13.1 , ≤ 63.21 (patch)
guessed Create a notification for this product.
NetScaler Gateway Affected: 14.1 , ≤ 73.32 (patch)
Affected: 13.1 , ≤ 63.21 (patch)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 29c4e748-68a3-4760-9212-bdb34a5a73ac

Vulnerability ID: CVE-2026-19490

Status: Confirmed

Status Updated: 2026-09-09 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-09
Asserted: 2026-09-09
Scope
Notes: Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability | Affected: Citrix / NetScaler | Description: 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. | 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. | Due date: 2026-09-12 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-288
Feed CISA Known Exploited Vulnerabilities Catalog
Product NetScaler
Due Date 2026-09-12
Date Added 2026-09-09
Vendorproject Citrix
Vulnerabilityname Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-09-09 20:00 UTC | Updated: 2026-09-09 20:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: d2a96374-0326-48a3-8d7d-ad148aa72408

Vulnerability ID: CVE-2026-19490

Status: Confirmed

Status Updated: 2026-09-03 11:43 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-03
Asserted: 2026-09-03
Scope
Notes: NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490 | Affected: NetScaler / ADC, Gateway | CVSS: 9.3 (CRITICAL) | EPSS: 0.03372 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490
Vendor NetScaler
Product ADC, Gateway
Added Date 2026-09-03T11:43:49.815Z
Cvss Score 9.3
Epss Score 0.03372
Cvss Severity CRITICAL
Epss Percentile 0.87926
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-09-04 12:00 UTC | Updated: 2026-09-04 12:00 UTC
Show details on NVD website
To clipboard 

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                  "value": "Vulnerability in NetScaler ADC and NetScaler Gateway.\u003cp\u003eThis 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.\u003c/p\u003e"
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                "Recovery": "NOT_DEFINED",
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                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 9.3,
                "baseSeverity": "CRITICAL",
                "exploitMaturity": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "LOW",
                "subConfidentialityImpact": "LOW",
                "subIntegrityImpact": "LOW",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "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",
                "version": "4.0",
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                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "format": "CVSS",
              "scenarios": [
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                  "lang": "en",
                  "value": "GENERAL"
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          "providerMetadata": {
            "dateUpdated": "2026-08-19T12:54:39.730Z",
            "orgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
            "shortName": "NetScaler"
          },
          "references": [
            {
              "url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939"
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          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490",
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        "assignerShortName": "NetScaler",
        "cveId": "CVE-2026-19490",
        "datePublished": "2026-08-19T12:54:39.730Z",
        "dateReserved": "2026-08-10T17:39:56.668Z",
        "dateUpdated": "2026-09-10T03:55:17.040Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.