{"_links":{"capec":{"href":"/api/v1/vulnerability/cve-2026-21858/capec"},"cvss":{"href":"/api/v1/vulnerability/cve-2026-21858/cvss"},"cwe":{"href":"/api/v1/vulnerability/cve-2026-21858/cwe"},"enrichment":{"href":"/api/v1/vulnerability/cve-2026-21858/enrichment"},"gcve":{"href":"/api/v1/vulnerability/cve-2026-21858/gcve"},"self":{"href":"/api/v1/vulnerability/cve-2026-21858"},"sightings":{"href":"/api/v1/sightings/cve-2026-21858"}},"data":{"nuclei":true,"nuclei_template":"http/cves/2026/CVE-2026-21858.yaml","nuclei_template_severity":"critical","nuclei_template_yaml":"id: CVE-2026-21858\n\ninfo:\n  name: n8n Webhooks - Remote Code Execution\n  author: rxerium\n  severity: critical\n  description: |\n    n8n is an open source workflow automation platform. Versions starting with 1.65.0 and below 1.121.0 enable an attacker to access files on the underlying server through execution of certain form-based workflows. A vulnerable workflow could grant access to an unauthenticated remote attacker, resulting in exposure of sensitive information stored on the system and may enable further compromise depending on deployment configuration and workflow usage. This issue is fixed in version 1.121.0.\n  impact: |\n    Unauthenticated remote attackers can access sensitive files, potentially leading to information disclosure and further system compromise.\n  remediation: |\n    Update to version 1.121.0 or later.\n  reference:\n    - https://thehackernews.com/2026/01/critical-n8n-vulnerability-cvss-100.html\n    - https://nvd.nist.gov/vuln/detail/CVE-2026-21858\n  classification:\n    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N\n    cvss-score: 10.0\n    cve-id: CVE-2026-21858\n    epss-score: 0.78447\n    epss-percentile: 0.99563\n    cwe-id: CWE-20\n  metadata:\n    verified: true\n    max-request: 2\n    shodan-query: http.favicon.hash:-831756631\n  tags: cve,cve2026,n8n,workflow,rce,vkev,vuln\n\nflow: http(1) || http(2)\n\nhttp:\n  - method: GET\n    path:\n      - \"{{BaseURL}}/signin\"\n\n    host-redirects: true\n    max-redirects: 3\n\n    extractors:\n      - type: regex\n        name: base64_content\n        group: 1\n        regex:\n          - '<meta name=\"n8n:config:sentry\" content=\"([A-Za-z0-9+/=]+)\"'\n        internal: true\n\n      - type: dsl\n        name: version\n        dsl:\n          - 'replace_regex(base64_decode(base64_content), \".*n8n@([0-9]+\\\\.[0-9]+\\\\.[0-9]+).*\", \"$1\")'\n        internal: true\n\n      - type: dsl\n        dsl:\n          - '\"n8n Version: \" + version'\n\n    matchers-condition: and\n    matchers:\n      - type: word\n        part: body\n        words:\n          - \"<title>n8n.io\"\n        case-insensitive: true\n\n      - type: status\n        status:\n          - 200\n\n      - type: dsl\n        dsl:\n          - 'compare_versions(version, \">= 1.65.0\", \"< 1.121.0\")'\n\n  - method: GET\n    path:\n      - \"{{BaseURL}}/rest/sentry.js\"\n\n    extractors:\n      - type: regex\n        name: version\n        group: 1\n        regex:\n          - 'release\":\"([0-9.]+)\"'\n        internal: true\n\n      - type: dsl\n        dsl:\n          - '\"n8n Version: \" + version'\n\n    matchers-condition: and\n    matchers:\n      - type: word\n        part: body\n        words:\n          - '\"release\"'\n        case-insensitive: true\n\n      - type: status\n        status:\n          - 200\n\n      - type: dsl\n        dsl:\n          - compare_versions(version, '>= 1.65.0', '< 1.121.0')\n# digest: 4b0a00483046022100cc0b5840916b4acf239edc209b88ee6fc8bdfa500be208ac6df4a21fedb6ec91022100e80184e6eb4081b793861ae0dd1dcaf1bb228be737a51ecb2c14b1cafcfa18a9:922c64590222798bb761d5b6d8e72950"},"source":"nuclei","vuln_id":"cve-2026-21858"}