Citrix NetScaler Improper Input Validation Vulnerability
Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.
CISA 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
Read at NIST National Vulnerability Database (CVE API 2.0)
- Vendor
- Citrix
- Product
- NetScaler
- EPSS
- 0.82 (p100)
- CISA KEV
- added 27 Sep 2026, due 30 Sep 2026 (32d overdue)
- Exploitation
- observed in the wild
- Fix
- available
- Weakness
- CWE-119
- Exposure class
- Edge / VPN / firewall
Why it ranks 90 (Critical)
- CISA KEV listed, remediation due 2026-09-30
- EPSS 0.82 (high probability of exploitation)
- Exposed product class: edge / VPN / firewall
- Widely deployed vendor product (Citrix)
- Covered by 14 independent sources
- Fix available
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- NIST National Vulnerability Database (CVE API 2.0) (nvd.nist.gov)
- Vendor advisory (support.citrix.com)
- CVE-2026-88771 on this site · NVD · CVE.org · Vulnpedia · KEV
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