{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-33665", "tracking": { "current_release_date": "2026-03-30T14:36:43.404662Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33665", "initial_release_date": "2026-03-25T18:27:46.953272Z", "revision_history": [ { "date": "2026-03-25T18:27:46.953272Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-25T18:27:48.217909Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-25T18:39:07.243173Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| Products created (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-25T18:39:10.886882Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-25T21:49:53.684910Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-25T21:50:00.595567Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-26T00:21:24.208072Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| References created (2).| CWES updated (1)." }, { "date": "2026-03-26T13:06:20.876117Z", "number": "8", "summary": "Source connected.| CVE status created. (valid)| Products connected (2).| References created (17)." }, { "date": "2026-03-26T13:06:22.468766Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-26T15:01:26.199069Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-26T15:01:29.537864Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-27T19:47:16.831977Z", "number": "12", "summary": "Unknown change." }, { "date": "2026-03-27T19:47:18.653635Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-30T14:36:33.033556Z", "number": "14", "summary": "CVSS created.| Products connected (2).| Product Identifiers created (2)." }, { "date": "2026-03-30T14:36:42.808943Z", "number": "15", "summary": "NCSC Score updated." } ], "status": "interim", "version": "15" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<1.121.0", "product": { "name": "vers:unknown/<1.121.0", "product_id": "CSAFPID-5348947", "product_identification_helper": { "cpe": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/<2.13.4", "product": { "name": "vers:unknown/<2.13.4", "product_id": "CSAFPID-5917555" } }, { "category": "product_version_range", "name": "vers:unknown/>=2.0.0|<2.4.0", "product": { "name": "vers:unknown/>=2.0.0|<2.4.0", "product_id": "CSAFPID-5558325", "product_identification_helper": { "cpe": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*" } } } ], "category": "product_name", "name": "n8n" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5446927", "product_identification_helper": { "cpe": "cpe:/a:n8n:n8n:-" } } } ], "category": "product_name", "name": "n8n n8n" } ], "category": "vendor", "name": "n8n" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<1.121.0", "product": { "name": "vers:unknown/<1.121.0", "product_id": "CSAFPID-5346162" } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<1.121.0", "product": { "name": "vers:unknown/>=0|<1.121.0", "product_id": "CSAFPID-5346154" } }, { "category": "product_version_range", "name": "vers:unknown/>=2.0.0-rc.0|<2.4.0", "product": { "name": "vers:unknown/>=2.0.0-rc.0|<2.4.0", "product_id": "CSAFPID-5908064" } } ], "category": "product_name", "name": "n8n" } ], "category": "vendor", "name": "n8n-io" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33665", "notes": [ { "category": "description", "text": "n8n is an open source workflow automation platform. Prior to versions 2.4.0 and 1.121.0, when LDAP authentication is enabled, n8n automatically linked an LDAP identity to an existing local account if the LDAP email attribute matched the local account's email. An authenticated LDAP user who could control their own LDAP email attribute could set it to match another user's email — including an administrator's — and upon login gain full access to that account. The account linkage persisted even if the LDAP email was later reverted, resulting in a permanent account takeover. LDAP authentication must be configured and active (non-default). The issue has been fixed in n8n versions 2.4.0 and 1.121.0. 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: Disable LDAP authentication until the instance can be upgraded, restrict LDAP directory permissions so that users cannot modify their own email attributes, and/or audit existing LDAP-linked accounts for unexpected account associations. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33665" }, { "category": "description", "text": "n8n is an open source workflow automation platform. Prior to versions 2.4.0 and 1.121.0, when LDAP authentication is enabled, n8n automatically linked an LDAP identity to an existing local account if the LDAP email attribute matched the local account's email. An authenticated LDAP user who could control their own LDAP email attribute could set it to match another user's email — including an administrator's — and upon login gain full access to that account. The account linkage persisted even if the LDAP email was later reverted, resulting in a permanent account takeover. LDAP authentication must be configured and active (non-default). The issue has been fixed in n8n versions 2.4.0 and 1.121.0. 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: Disable LDAP authentication until the instance can be upgraded, restrict LDAP directory permissions so that users cannot modify their own email attributes, and/or audit existing LDAP-linked accounts for unexpected account associations. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33665.json" }, { "category": "description", "text": "## Impact\nWhen LDAP authentication is enabled, n8n automatically linked an LDAP identity to an existing local account if the LDAP email attribute matched the local account's email. An authenticated LDAP user who could control their own LDAP email attribute could set it to match another user's email — including an administrator's — and upon login gain full access to that account. The account linkage persisted even if the LDAP email was later reverted, resulting in a permanent account takeover.\n\n- LDAP authentication must be configured and active (non-default).\n\n## Patches\nThe issue has been fixed in n8n versions 2.4.0 and 1.121.0. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Disable LDAP authentication until the instance can be upgraded.\n- Restrict LDAP directory permissions so that users cannot modify their own email attributes.\n- Audit existing LDAP-linked accounts for unexpected account associations.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.", "title": "github - https://api.github.com/advisories/GHSA-c545-x2rh-82fc" }, { "category": "description", "text": "## Impact\nWhen LDAP authentication is enabled, n8n automatically linked an LDAP identity to an existing local account if the LDAP email attribute matched the local account's email. An authenticated LDAP user who could control their own LDAP email attribute could set it to match another user's email — including an administrator's — and upon login gain full access to that account. The account linkage persisted even if the LDAP email was later reverted, resulting in a permanent account takeover.\n\n- LDAP authentication must be configured and active (non-default).\n\n## Patches\nThe issue has been fixed in n8n versions 2.4.0 and 1.121.0. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Disable LDAP authentication until the instance can be upgraded.\n- Restrict LDAP directory permissions so that users cannot modify their own email attributes.\n- Audit existing LDAP-linked accounts for unexpected account associations.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-c545-x2rh-82fc.json?alt=media" }, { "category": "other", "text": "0.00013", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:L/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", "title": "CVSSV4" }, { "category": "other", "text": "8.8", "title": "CVSSV4 base score" }, { "category": "other", "text": "5.0", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "The value of the most recent EPSS score, Is related to (a version of) an uncommon product", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5346162", "CSAFPID-5908064", "CSAFPID-5346154", "CSAFPID-5446927", "CSAFPID-5917555", "CSAFPID-5348947", "CSAFPID-5558325" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33665" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33665.json" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-c545-x2rh-82fc" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-c545-x2rh-82fc.json?alt=media" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0877.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-c545-x2rh-82fc" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33665" }, { "category": "external", "summary": "Reference - certbundde; github", "url": "https://github.com/advisories/GHSA-c545-x2rh-82fc" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0877.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0877" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-43v7-fp2v-68f6" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-58qr-rcgv-642v" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-fxcw-h3qj-8m8p" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-m63j-689w-3j35" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-mxrg-77hm-89hv" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-q4fm-pjq6-m63g" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-qfc3-hm4j-7q77" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-vpgc-2f6g-7w7x" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-w673-8fjw-457c" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-w83q-mcmx-mh42" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-364x-8g5j-x2pr" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/n8n-io/n8n/releases" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N", "baseScore": 8.2, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-5346154", "CSAFPID-5346162", "CSAFPID-5348947", "CSAFPID-5446927", "CSAFPID-5558325", "CSAFPID-5908064", "CSAFPID-5917555" ] } ], "title": "CVE-2026-33665" } ] }