Is CVE-2026-19490 actively exploited?

Yes. Previdian has observed exploitation attempts targeting this CVE. Confidence is medium.

What exploitation activity has Previdian observed?

Previdian sensors have observed 10 exploitation attempts, 6 unique attacker IPs, and 4 countries targeting CVE-2026-19490. First observed Sep 03, 2026; last observed Sep 04, 2026.

Which versions are affected?

CVE-2026-19490 affects NetScaler ADC, Gateway. Previdian lists 4 version rows; examples include 14.1 to <= 73.32 and 13.1 to <= 63.21.

How should organizations remediate it?

Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.

No. CVE-2026-19490 is not currently listed in CISA KEV.

CVE-2026-19490 Exploitation Observed — ADC, Gateway

Q: What is CVE-2026-19490?

CVE-2026-19490 is an unauthenticated NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490. 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.

Q: How should organizations remediate it?

Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.

Q: Is it in CISA KEV?

No. CVE-2026-19490 is not currently listed in CISA KEV.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-19490 is an unauthenticated NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490. Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: from 14.1 through 73.32 and...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with medium confidence.

Who is affected?

NetScaler / ADC 14.1 to <= 73.32.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Vulnerability in NetScaler ADC and NetScaler Gateway

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.

Vendor Product Affected Status

NetScaler ADC Through 73.32 Affected

NetScaler ADC Through 63.21 Affected

NetScaler Gateway Through 73.32 Affected

NetScaler Gateway Through 63.21 Affected

Published: 19 Aug 2026
Exploitation Reported: 03 Sep 2026
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-19490
support.citrix.com/support-home/kbsearch/article support.citrix.com · CVE Record https://support.citrix.com/support-home/kbsearch/article?articleNumbe...

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Previdian

Recorded 03 Sep 2026

Independent exploitation attestation added to the Previdian record.

Active exploitation observed

Previdian sensor

First observed 03 Sep 2026

First-party sensor telemetry confirms matching exploitation attempts.

Proof of concept available

GitHub

Recorded 02 Sep 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access

Source	Added
Previdian First	2026-09-03 11:43 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Aggregate observations show the scale, recency, and distribution of activity without overstating sparse data.

10

Attempts observed

6

Unique attacker IPs

4

Attacker countries

AU · DE · JP · US

1

Sensors observed

Exploitation attempts over the last 7 days

Daily events observed by Previdian sensors

Updated 04 Sep 2026

0

6

4

29 Aug 30 Aug 31 Aug 1 Sep 2 Sep 3 Sep 4 Sep

First observed 03 Sep 2026 · Last observed 04 Sep 2026

Pro adds sensor region and window summaries. Enterprise adds raw IPs, paths, User-Agents, and payloads.

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 9
User-Agents: 4
Callback hosts: 0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Risk and context

Severity, weaknesses, and research context

CVSS v4.0

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

EPSS

3.4%

Weaknesses

Authentication Bypass Using an Alternate Path or Channel CWE-288

Recent mention · BleepingComputer

Critical Citrix NetScaler auth bypass now leveraged in attacks

Attackers have begun targeting a critical-severity Citrix NetScaler auth bypass flaw (CVE-2026-19490) in the wild, according to vulnerability intelligence company Previdian. [...]

Read full advisory

All Mentions

Recent mention · BleepingComputer

Critical Citrix NetScaler auth bypass now leveraged in attacks

BleepingComputer · 04 Sep 2026

Attackers have begun targeting a critical-severity Citrix NetScaler auth bypass flaw (CVE-2026-19490) in the wild, according to vulnerability intelligence company Previdian. [...]

Recent mention · CERT Polska

Podatności w NetScaler ADC i NetScaler Gateway

CERT Polska · 21 Aug 2026

Zespół CERT Polska informuje o podatnościach znalezionych w produktach NetScaler ADC (dawniej Citrix ADC) oraz NetScaler Gateway (dawniej Citrix Gateway).Producent opublikował biuletyn bezpieczeństwa opisujący dwie podatności: CVE-2026-19489 oraz CVE-2026-19490.Szczególnie istotna jest luka CVE-2026-19490, która umożliwia obejście mechanizmów uwierzytelniania na urządzeniach skonfigurowanych jako Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) lub AAA vserver. W wybranych wersjach jej wykorzystanie wymaga dodatkowej konfiguracji SAML.Druga podatność (CVE-2026-19489) dotyczy możliwości...

Recent mention · Rapid7

CVE-2026-19490: Critical Vulnerability Affecting Citrix NetScaler ADC and NetScaler Gateway

Rapid7 · 19 Aug 2026

OverviewOn August 19, 2026, a security advisory was published for CVE-2026-19490, a critical authentication bypass vulnerability affecting Citrix NetScaler ADC and NetScaler Gateway. The vulnerability carries a CVSS v4.0 base score of 9.3 and can be exploited remotely by an unauthenticated attacker over the network without user interaction or elevated privileges.NetScaler ADC and NetScaler Gateway are widely deployed enterprise networking products commonly positioned at or near the network perimeter. NetScaler ADC provides application delivery, traffic management, load balancing, SSL/TLS...

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

TarPeg007/CVE-2026-19490

github · Created 2026-09-02 15:43:53 UTC · 0 stars · AI assessment 90%

NetScaler ADC/Gateway SAML unsigned-assertion bypass via HTTP-Redirect binding (CTX696939) - root cause analysis + PoC

Timeline

From disclosure to observed exploitation

03 Sep 2026
Observed by Previdian sensors

Evidence-backed exploitation signal
03 Sep 2026
Indicators of compromise added (6)

Indicators of compromise recorded
02 Sep 2026
Public PoC available

Public proof-of-concept code published
20 Aug 2026
Added to the Previdian watchlist

Pro and Enterprise Watch users had 2 weeks of early warning before Previdian confirmed it as a KEV.
19 Aug 2026
CVE published

Vulnerability disclosed publicly
10 Aug 2026
CVE ID reserved

Identifier reserved by the CNA

Pro API

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Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-19490

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2026-19490",
  "confidence": "Medium",
  "cvss_score": 9.3,
  "cvss_estimated": false,
  "epss_score": 0.03372,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 10, "sensors": 1 }
}

CVE-2026-19490

Vulnerability in NetScaler ADC and NetScaler Gateway

CVE References

Exploited in the wild

Active exploitation observed

Proof of concept available

Known exploited vulnerability sources

Observed signals

Scanner coverage

Virtual patch status

Attacker IP Indicators

Weaknesses

Critical Citrix NetScaler auth bypass now leveraged in attacks

All Mentions

Potential Proof of Concepts

Observed by Previdian sensors

Indicators of compromise added (6)

Public PoC available

Added to the Previdian watchlist

CVE published

CVE ID reserved

Automate this intelligence