[NEW] [high] Citrix Systems NetScaler (Gateway and ADC): Multiple vulnerabilities

highCVE-2026-19489 CVE-2026-19490

An attacker can exploit multiple vulnerabilities in Citrix Systems NetScaler (Gateway and ADC) to perform denial of service attacks and bypass security measures.

CSIRTS triage

vendor: Citrix Systems product: NetScaler (Gateway and ADC)Denial of service Authentication bypass

What: Multiple vulnerabilities enable denial-of-service attacks and security measure bypass in NetScaler Gateway and ADC.
Who is affected: Organizations deploying Citrix NetScaler Gateway or ADC products.
Urgency: High priority as these are critical gateway and access control devices; DoS and auth bypass create significant risk.
Action: Apply Citrix security updates for CVE-2026-19489 and CVE-2026-19490 urgently.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-08-20
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2927

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-194890.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-194900.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-19489	coverage & exploitation status	NVD · CVE.org
CVE-2026-19490	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Citrix Systems NetScaler

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[UPDATE] [high] Citrix Systems NetScaler ADC and Gateway: Multiple vulnerabilitiescert-bund · 2026-07-02