{"id":"CVE-2026-89435","aliases":[],"cve":{"records":[{"id":"CVE-2026-89435","source":"Wordfence","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-11T19:36:16.010Z","published":"2026-10-30T06:47:31.045Z","modified":"2026-10-30T18:09:00.504Z"}],"publishers":[{"name":"Wordfence","role":"CNA","organizationId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","modified":"2026-10-30T06:47:31.045Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-30T18:09:00.504Z"}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/87661de6-e835-495e-9bd2-4d64b4718108?source=cve","tags":[],"source":"Wordfence"},{"url":"https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAddonsController.php#L1514","tags":[],"source":"Wordfence"},{"url":"https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAddonsController.php#L1489","tags":[],"source":"Wordfence"},{"url":"https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/helpers/FrmAppHelper.php#L4934","tags":[],"source":"Wordfence"},{"url":"https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAddonsController.php#L1459","tags":[],"source":"Wordfence"},{"url":"https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAppController.php#L1167","tags":[],"source":"Wordfence"},{"url":"https://plugins.trac.wordpress.org/changeset?reponame=&new=3750372%40formidable%2Ftags%2F7.0&old=3688662%40formidable%2Ftags%2F6.35","tags":[],"source":"Wordfence"},{"url":"https://plugins.trac.wordpress.org/changeset/3746820/formidable/trunk/classes/controllers/FrmAddonsController.php","tags":[],"source":"Wordfence"}],"weaknesses":[{"id":"CWE-74","description":"CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component","source":"Wordfence"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-30T17:32:42.670504Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"total"}]}]},"title":"Formidable Forms <= 6.35 - Authenticated (Subscriber+) Arbitrary Plugin Installation via 'file_url' Parameter","titleSource":"Wordfence","descriptionSource":"Wordfence","description":"The Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More plugin for WordPress is vulnerable to Arbitrary Plugin Installation in all versions up to, and including, 6.35 via the 'file_url' parameter parameter. This is due to insufficient URL prefix validation in validate_url_is_in_s3_bucket() and a permission callback that relies solely on a shared token obtainable by any user with the delegable frm_view_forms capability, without checking install_plugins or activate_plugins capabilities. This makes it possible for authenticated attackers, with subscriber-level access and above, to install arbitrary plugins on the server. Exploitation additionally requires that the site is free-only (Formidable Pro is NOT installed).","score":8.8,"severity":"high","published":"2026-10-30T06:47:31.045Z","modified":"2026-10-30T18:09:00.504Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"strategy11team","name":"Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"6.35","versionType":"semver"}],"defaultStatus":"unaffected","cpes":[],"source":"Wordfence","url":"https://www.cve.org/CVERecord?id=CVE-2026-89435"}],"remediation":[],"references":["https://www.wordfence.com/threat-intel/vulnerabilities/id/87661de6-e835-495e-9bd2-4d64b4718108?source=cve","https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAddonsController.php#L1514","https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAddonsController.php#L1489","https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/helpers/FrmAppHelper.php#L4934","https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAddonsController.php#L1459","https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAppController.php#L1167","https://plugins.trac.wordpress.org/changeset?reponame=&new=3750372%40formidable%2Ftags%2F7.0&old=3688662%40formidable%2Ftags%2F6.35","https://plugins.trac.wordpress.org/changeset/3746820/formidable/trunk/classes/controllers/FrmAddonsController.php"],"sources":[{"name":"CVE","id":"CVE-2026-89435","modified":"2026-10-30T18:09:00.504Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-89435"}],"assessments":[{"source":"Wordfence","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8}],"sourceAffected":[],"observedAt":"2026-10-30T19:13:10.371Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T09:10:30.844Z"},"coverage":[{"source":"NVD","status":"no-result","checkedAt":"2026-10-30T07:05:36.014Z","attemptedAt":"2026-10-30T07:05:36.014Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-10-30T07:05:34.394Z","attemptedAt":"2026-10-30T07:05:34.394Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-30T07:05:34.554Z","attemptedAt":"2026-10-30T07:05:34.554Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-30T07:05:34.282Z","attemptedAt":"2026-10-30T07:05:34.282Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-113736","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-113736","modified":"Oct 30, 2026, 6:47:31 AM","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","checkedAt":"2026-10-30T07:05:34.554Z"}],"aiSummary":{"text":"Formidable Forms WordPress plugin versions up to 6.35 are vulnerable to arbitrary plugin installation via the 'file_url' parameter. This affects sites with subscriber-level access and above, without Formidable Pro installed. Insufficient URL prefix validation and inadequate permission checks are the weaknesses.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T08:56:27.486Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-89435"}]}}