CVE-2026-33751

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{"affected": [{"affectedData": [{"product": "n8n", "vendor": "n8n-io", "versions": [{"status": "affected", "version": "< 1.123.27"}, {"status": "affected", "version": ">= 2.0.0-rc.0, < 2.13.3"}, {"status": "affected", "version": "= 2.14.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "C5E7FBA6-35F5-426D-8BAA-25C7913A966A", "versionEndExcluding": "1.123.27", "vulnerable": true}, {"criteria": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "8ACE2AF2-6C9A-41A8-9883-6F2149E24151", "versionEndExcluding": "2.13.3", "versionStartIncluding": "2.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:n8n:n8n:2.14.0:*:*:*:*:node.js:*:*", "matchCriteriaId": "22BDDF0A-0915-4FF2-920C-E75F2F2F677D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "n8n is an open source workflow automation platform. Prior to versions 1.123.27, 2.13.3, and 2.14.1, a flaw in the LDAP node's filter escape logic allowed LDAP metacharacters to pass through unescaped when user-controlled input was interpolated into LDAP search filters. In workflows where external user input is passed via expressions into the LDAP node's search parameters, an attacker could manipulate the constructed filter to retrieve unintended LDAP records or bypass authentication checks implemented in the workflow. Exploitation requires a specific workflow configuration. The LDAP node must be used with user-controlled input passed via expressions (e.g., from a form or webhook). The issue has been fixed in n8n versions 1.123.27, 2.13.3, and 2.14.1. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations: Limit workflow creation and editing permissions to fully trusted users only, disable the LDAP node by adding `n8n-nodes-base.ldap` to the `NODES_EXCLUDE` environment variable, and/or avoid passing unvalidated external user input into LDAP node search parameters via expressions. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures."}, {"lang": "es", "value": "n8n es una plataforma de automatizaci\u00f3n de flujos de trabajo de c\u00f3digo abierto. Antes de las versiones 1.123.27, 2.13.3 y 2.14.1, un fallo en la l\u00f3gica de escape de filtros del nodo LDAP permit\u00eda que los metacaracteres LDAP pasaran sin escapar cuando la entrada controlada por el usuario se interpolaba en los filtros de b\u00fasqueda LDAP. En flujos de trabajo donde la entrada de usuario externa se pasa a trav\u00e9s de expresiones a los par\u00e1metros de b\u00fasqueda del nodo LDAP, un atacante podr\u00eda manipular el filtro construido para recuperar registros LDAP no deseados o eludir las comprobaciones de autenticaci\u00f3n implementadas en el flujo de trabajo. La explotaci\u00f3n requiere una configuraci\u00f3n de flujo de trabajo espec\u00edfica. El nodo LDAP debe usarse con entrada controlada por el usuario pasada a trav\u00e9s de expresiones (por ejemplo, desde un formulario o webhook). El problema se ha solucionado en las versiones de n8n 1.123.27, 2.13.3 y 2.14.1. Los usuarios deben actualizar a una de estas versiones o posteriores para remediar la vulnerabilidad. Si la actualizaci\u00f3n no es posible de inmediato, los administradores deben considerar las siguientes mitigaciones temporales: Limitar los permisos de creaci\u00f3n y edici\u00f3n de flujos de trabajo solo a usuarios de plena confianza, deshabilitar el nodo LDAP a\u00f1adiendo `n8n-nodes-base.ldap` a la variable de entorno `NODES_EXCLUDE`, y/o evitar pasar entrada de usuario externa no validada a los par\u00e1metros de b\u00fasqueda del nodo LDAP a trav\u00e9s de expresiones. Estas soluciones provisionales no remedian completamente el riesgo y solo deben usarse como medidas de mitigaci\u00f3n a corto plazo."}], "id": "CVE-2026-33751", "lastModified": "2026-06-17T10:38:02.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 2.5, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33751", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-25T19:10:55.970733Z", "version": "2.0.3"}}]}, "published": "2026-03-25T19:16:51.670", "references": [{"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-w83q-mcmx-mh42"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-90"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.123.27)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0-rc.0,2.13.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.14.0"}}], "enrichment": {"confidence": 82.0, "confidence_source": "matching", "scores": [{"score": 82.0, "source": "matching"}]}, "original": {"product": "n8n", "source": "cna", "vendor": "n8n-io"}, "product": "n8n", "vendor": "n8n"}], "analysis": {"en": {"generated_at": "2026-03-27T20:26:04.303692+00:00", "value": {"mitigation_remediation": ["Upgrade n8n to version 1.123.27, 2.13.3, 2.14.1, or later", "Restrict permissions for workflow editing so only trusted users can create or modify workflows that use the LDAP node", "Set the environment variable NODES_EXCLUDE to include n8n-nodes-base.ldap to disable the vulnerable node", "Avoid passing unvalidated external user input into the LDAP node\u2019s search parameters via expressions", "If no upgrade possible, monitor for updates and apply fixes as soon as available"], "summary": {"action": "Immediate Patch", "impact": "Unauthorized LDAP information disclosure or authentication bypass via crafted inputs"}, "threat_synthesis": {"affected_systems": "The vulnerability affects n8n workloads running any of the following versions: 1.122.0 through 1.123.26, 2.13.0 through 2.13.2, and 2.14.0. Users of n8n 2.14.1 or newer, or 1.123.27 or newer, are not affected. The impact is limited to systems that deploy the LDAP node within workflows that accept externally supplied expressions, such as forms or webhooks, and do not sanitize that input before passing it to the node.", "description_and_impact": "n8n\u2019s LDAP node contains a flaw in its filter\u2011escaping logic that allows LDAP metacharacters to cross the boundary when user\u2011controlled data is interpolated into search filters. This enables an attacker to craft a filter that returns records the workflow should not see or bypass workflow\u2011level authentication checks. The weakness corresponds to CWE\u201190 and can lead to confidential data leakage or unauthorized access within the target directory.", "risk_and_exploitability": "The CVSS score of 6.3 indicates a medium risk if the required workflow conditions are met. The EPSS score of less than 1% suggests low exploit probability at this time, and the vulnerability is not in the CISA KEV list. An attacker would need an operational n8n instance with the LDAP node enabled, a workflow that passes user input to the node via an expression, and the ability to supply crafted LDAP filter components. Successful exploitation can expose sensitive directory data or allow an attacker to bypass authentication embedded in the workflow."}}}}, "created": "2026-03-25T21:46:27.075005+00:00", "updated": "2026-03-29T20:28:11.778959+00:00", "vendors": ["n8n", "n8n$PRODUCT$n8n"]}