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01 Record

CVE-2026-88771

A remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commands

CriticalKEVPUBLISHEDCNA: NetScaler
CNA base score9.5 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
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02 Description

A remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commands

03 Exploitation and scoring

Exploitation
Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2026-09-27. Federal remediation due 2026-09-30.
SSVC decision
  • ExploitationactiveCISA reports credible evidence of active exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.03% probability of exploitation activity in the next 30 days.
EPSS percentile
Ranks above 62.2% of scored records. A rank, not a probability.
NVD base score
9.5 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Analyzed. NVD last modified this record on 2026-09-28.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-09-27 16:02Z1 DAY AGO
Last updated
2026-09-28 12:43Z9 HR AGO
Reserved
2026-09-10
Assigning CNA
NetScaler
Record state
PUBLISHED
Severity
Critical (CVSS 9.5)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Weaknesses
  • CWE-20Improper Input ValidationClass
Data version
5.2
Document digest
aa0945e08b82526a6501a93c3e3dfb6d3cdf988595a95c00790f44c2cb405d86

05 Affected products

VendorProductVersionsPlatforms
Citrix NetScalerADC0 to < 14.1-73.37, 0 to < 13.1-64.23, 0 to < 14.1-73.37 FIPS, 0 to < 13.1.37.279 FIPS and NDcPP—
Citrix NetScalerGateway0 to < 14.1-73.37, 0 to < 13.1-64.23—

06 References