How severe is CVE-2026-19490?

No CVSS score has been assigned to CVE-2026-19490 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-19490?

Affected package information for CVE-2026-19490 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2026-19490?

No fixed release is recorded for CVE-2026-19490 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

How do I detect CVE-2026-19490 in my code and dependencies?

Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

How do I mitigate CVE-2026-19490 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2026-19490 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2026-19490, including . All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2026-19490?

CVE-2026-19490 has an EPSS (Exploit Prediction Scoring System) score of 23.2%, placing it in the 98th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

Is CVE-2026-19490 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2026-19490 (Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-09-09. CISA required all US federal civilian agencies to remediate this vulnerability by 2026-09-12. The required action was: 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. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2026-19490?

CVE-2026-19490 is classified as CWE-288 (CWE-288). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-19490 published, and has it been updated?

CVE-2026-19490 was published on August 19, 2026 and was last updated on October 7, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV · ACTIVELY EXPLOITED

CVE-2026-19490

CVE-2026-19490 is a CWE-288 vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-09-09) — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.

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.

Published

Aug 19, 2026

Updated

Oct 7, 2026

Affected

2 products

Patched

See advisory

Exploits

1 known

Exploitation data as of Oct 6, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-09-09. Federal agencies were required to remediate by 2026-09-12.
CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2026-19490.

EPSS Exploitation Probability

via FIRST.org ↗

23.2%probability of exploitation in next 30 days

Moderate Risk+15.19%

Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Description

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.

Affected Products

2 products · 7 configurations

Application

netscaler application delivery controllercitrix

≥ 14.1-66.68 && ≤ 14.1-73.32

range

Application

netscaler gatewaycitrix

≥ 14.1 && < 14.1-73.32

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

TarPeg007/CVE-2026-19490

NetScaler ADC/Gateway SAML unsigned-assertion bypass via HTTP-Redirect b

⭐ 17🍴 5Sep 2026

Detection & mitigation playbook

Vulnerability

Detect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2026-19490 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

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