CVE-2026-88771

{"id": "CVE-2026-88771", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-88771", "role": "CISA Coordinator", "options": [{"exploitation": "active"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-09-27T00:00:00+00:00"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.5, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5", "affectedData": [{"vendor": "Citrix NetScaler", "product": "ADC", "versions": [{"status": "affected", "version": "0", "lessThan": "14.1-73.37", "versionType": "patch"}, {"status": "affected", "version": "0", "lessThan": "13.1-64.23", "versionType": "patch"}, {"status": "affected", "version": "0", "lessThan": "14.1-73.37 FIPS", "versionType": "patch"}, {"status": "affected", "version": "0", "lessThan": "13.1.37.279 FIPS and NDcPP", "versionType": "patch"}], "defaultStatus": "unaffected"}, {"vendor": "Citrix NetScaler", "product": "Gateway", "versions": [{"status": "affected", "version": "0", "lessThan": "14.1-73.37", "versionType": "patch"}, {"status": "affected", "version": "0", "lessThan": "13.1-64.23", "versionType": "patch"}], "defaultStatus": "unaffected"}]}], "published": "2026-09-27T17:16:56.260", "references": [{"url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096", "tags": ["Vendor Advisory"], "source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5"}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88771", "tags": ["US Government Resource"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5", "description": [{"lang": "en", "value": "CWE-20"}]}], "descriptions": [{"lang": "en", "value": "Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.\n\nThis issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to\u00a0an unauthenticated attacker to execute arbitrary commands."}, {"lang": "es", "value": "Vulnerabilidad de validaci\u00f3n de entrada inadecuada en Citrix NetScaler ADC y Citrix NetScaler Gateway.\n\nEste problema afecta a ADC en versiones anteriores a 14.1-73.37, 13.1-64.23, 14.1-73.37 FIPS, y 13.1.37.279 FIPS y NDcPP; y a Gateway en versiones anteriores a 14.1-73.37 y 13.1-64.23, lo que permite a un atacante no autenticado ejecutar comandos arbitrarios."}], "lastModified": "2026-09-29T04:18:01.603", "cisaActionDue": "2026-09-30", "cisaExploitAdd": "2026-09-27", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "6BC2D462-9ABE-4024-8E46-8D265C0B19FB", "versionEndExcluding": "13.1-64.23", "versionStartIncluding": "13.1"}, {"criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*", "vulnerable": true, "matchCriteriaId": "2DB314FE-3886-4ABD-A820-B8A70EBB23A6", "versionEndExcluding": "13.1.37.279", "versionStartIncluding": "13.1"}, {"criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*", "vulnerable": true, "matchCriteriaId": "FCFFA1B3-87CE-4CC8-990E-D3CE0B55CD45", "versionEndExcluding": "13.1.37.279", "versionStartIncluding": "13.1"}, {"criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "1CA9588A-E3EB-44FC-9515-6EB89BB8C1D6", "versionEndExcluding": "14.1-73.37", "versionStartIncluding": "14.1"}, {"criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*", "vulnerable": true, "matchCriteriaId": "046FF602-D956-4961-89BF-2041A3590004", "versionEndIncluding": "14.1-73.37", "versionStartIncluding": "14.1-66.68"}, {"criteria": "cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3286D2C3-EA7E-4D9C-95DE-05D462DC8B1B", "versionEndExcluding": "13.1-64.23", "versionStartIncluding": "13.1"}, {"criteria": "cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C77243A7-1FDB-4557-88BE-EDF3BAA56A81", "versionEndExcluding": "14.1-73.37", "versionStartIncluding": "14.1"}], "operator": "OR"}]}], "sourceIdentifier": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5", "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (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.", "cisaVulnerabilityName": "Citrix NetScaler Improper Input Validation Vulnerability"}