{"schemaVersion":3,"id":"CVE-2021-24381","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"The Ninja Forms Contact Form WordPress plugin before 3.5.8.2 does not sanitise and escape the custom class name of the form field created, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.","dates":{"published":"2021-10-25T13:20:32.000Z","modified":"2024-08-03T19:28:23.777Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.8,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":3.5,"severity":"low","vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"wordfence","score":4.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00617,"percentile":0.48598,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00617},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00617,"percentile":0.48598}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00617,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00617,"percentile":0.48598}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_4A4C6FB9211D9418","name":"Exploit Reference (wpscan.com)","source":"reference","url":"https://wpscan.com/vulnerability/e383fae6-e0da-4aba-bb62-adf51c01bf8d","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","description":"The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/79.html"}],"affected":[{"vendor":"ninjaforms","product":"contact_form","name":"contact form","label":"contact_form","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 3.5.8.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.5.8.2","eol":null,"hubHref":"/vendor/ninjaforms/contact_form"},{"vendor":"unknown","product":"ninja forms contact form – the drag and drop form builder for wordpress","name":"Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress","label":"ninja forms contact form – the drag and drop form builder for wordpress","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.5.8.2, < 3.5.8.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.5.8.2, < 3.5.8.2","eol":null,"hubHref":"/vendor/unknown/ninja_forms_contact_form_-_the_drag_and_drop_form_builder_for_wordpress"},{"vendor":"wordpress","product":"ninja-forms","name":"Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder","label":"ninja-forms","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 3.5.8.2","noFixRecorded":false,"fixedIn":"3.5.8.2"}],"versionsText":"< 3.5.8.2","eol":null,"hubHref":null}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://wpscan.com/vulnerability/e383fae6-e0da-4aba-bb62-adf51c01bf8d","label":"wpscan.com/vulnerability/e383fae6-e0da-4aba-bb62-adf51c01bf8d","hostname":"wpscan.com","tags":["X Refsource MISC","Exploit","Third Party Advisory"]},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/8703c76b-89c6-438a-b953-03847d965096","label":"www.wordfence.com/threat-intel/vulnerabilities/id/8703c76b-89c6-438a-b953-03847d965096","hostname":"www.wordfence.com","tags":["Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-10-25T13:20:32.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-03T19:28:23.777Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":29,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T19:34:26.836Z","stale":false,"partial":false}}