CVE-2026-18331

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-18331", "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "state": "PUBLISHED", "assignerShortName": "Wordfence", "dateReserved": "2026-07-29T20:30:50.552Z", "datePublished": "2026-08-26T06:08:28.961Z", "dateUpdated": "2026-08-26T14:08:15.044Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "shortName": "Wordfence", "dateUpdated": "2026-08-26T06:08:28.961Z"}, "affected": [{"vendor": "strategy11team", "product": "Formidable Forms \u2013 WordPress Form Builder for Contact Forms, Calculators, Quizzes & More", "versions": [{"version": "0", "status": "affected", "lessThanOrEqual": "6.33.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "The Formidable Forms \u2013 WordPress Form Builder for Contact Forms, Calculators, Quizzes & More plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'frm_user_id' parameter in all versions up to, and including, 6.33.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. By forging frm_user_id to match an administrator's user ID \u2014 discoverable via the public WordPress REST API \u2014 an unauthenticated attacker causes wp_kses_post() to serve as the only output filter, which preserves the injected payload structurally intact; the plugin's admin JavaScript then decodes and executes it automatically on page load."}], "title": "Formidable Forms <= 6.33.1 - Unauthenticated Stored Cross-Site Scripting via 'frm_user_id' Parameter", "references": [{"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/f03b09ad-257c-48c9-8ecc-36f60f178f80?source=cve"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/fields/FrmFieldType.php#L1830"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/fields/FrmFieldType.php#L2083"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/js/formidable_admin.js#L1"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/FrmEntry.php#L982"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/FrmEntry.php#L819"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/FrmEntry.php#L846"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/controllers/FrmEntriesController.php#L752"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/controllers/FrmHooksController.php#L69"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "cweId": "CWE-79", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "baseScore": 7.2, "baseSeverity": "HIGH"}}], "credits": [{"lang": "en", "type": "finder", "value": "daroo"}], "timeline": [{"time": "2026-07-29T20:46:09.000Z", "lang": "en", "value": "Vendor Notified"}, {"time": "2026-08-25T17:44:46.000Z", "lang": "en", "value": "Disclosed"}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-26T14:08:07.466102Z", "id": "CVE-2026-18331", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-26T14:08:15.044Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-18331", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-26T14:08:07.466102Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-26T14:08:12.209Z"}}], "cna": {"title": "Formidable Forms <= 6.33.1 - Unauthenticated Stored Cross-Site Scripting via 'frm_user_id' Parameter", "credits": [{"lang": "en", "type": "finder", "value": "daroo"}], "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.2, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"}}], "affected": [{"vendor": "strategy11team", "product": "Formidable Forms \u2013 WordPress Form Builder for Contact Forms, Calculators, Quizzes & More", "versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "6.33.1"}], "defaultStatus": "unaffected"}], "timeline": [{"lang": "en", "time": "2026-07-29T20:46:09.000Z", "value": "Vendor Notified"}, {"lang": "en", "time": "2026-08-25T17:44:46.000Z", "value": "Disclosed"}], "references": [{"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/f03b09ad-257c-48c9-8ecc-36f60f178f80?source=cve"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/fields/FrmFieldType.php#L1830"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/fields/FrmFieldType.php#L2083"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/js/formidable_admin.js#L1"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/FrmEntry.php#L982"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/FrmEntry.php#L819"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/FrmEntry.php#L846"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/controllers/FrmEntriesController.php#L752"}, {"url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/controllers/FrmHooksController.php#L69"}], "descriptions": [{"lang": "en", "value": "The Formidable Forms \u2013 WordPress Form Builder for Contact Forms, Calculators, Quizzes & More plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'frm_user_id' parameter in all versions up to, and including, 6.33.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. By forging frm_user_id to match an administrator's user ID \u2014 discoverable via the public WordPress REST API \u2014 an unauthenticated attacker causes wp_kses_post() to serve as the only output filter, which preserves the injected payload structurally intact; the plugin's admin JavaScript then decodes and executes it automatically on page load."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}], "providerMetadata": {"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "shortName": "Wordfence", "dateUpdated": "2026-08-26T06:08:28.961Z"}}}, "cveMetadata": {"cveId": "CVE-2026-18331", "state": "PUBLISHED", "dateUpdated": "2026-08-26T14:08:15.044Z", "dateReserved": "2026-07-29T20:30:50.552Z", "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "datePublished": "2026-08-26T06:08:28.961Z", "assignerShortName": "Wordfence"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Formidable Forms \u2013 WordPress Form Builder for Contact Forms, Calculators, Quizzes & More", "vendor": "strategy11team", "versions": [{"lessThanOrEqual": "6.33.1", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@wordfence.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The Formidable Forms \u2013 WordPress Form Builder for Contact Forms, Calculators, Quizzes & More plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'frm_user_id' parameter in all versions up to, and including, 6.33.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. By forging frm_user_id to match an administrator's user ID \u2014 discoverable via the public WordPress REST API \u2014 an unauthenticated attacker causes wp_kses_post() to serve as the only output filter, which preserves the injected payload structurally intact; the plugin's admin JavaScript then decodes and executes it automatically on page load."}], "id": "CVE-2026-18331", "lastModified": "2026-08-26T16:19:05.917", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.2, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.7, "source": "security@wordfence.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18331", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-26T14:08:07.466102Z", "version": "2.0.3"}}]}, "published": "2026-08-26T07:16:45.360", "references": [{"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/controllers/FrmEntriesController.php#L752"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/controllers/FrmHooksController.php#L69"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/FrmEntry.php#L819"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/FrmEntry.php#L846"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/FrmEntry.php#L982"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/fields/FrmFieldType.php#L1830"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/classes/models/fields/FrmFieldType.php#L2083"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/formidable/trunk/js/formidable_admin.js#L1"}, {"source": "security@wordfence.com", "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/f03b09ad-257c-48c9-8ecc-36f60f178f80?source=cve"}], "sourceIdentifier": "security@wordfence.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security@wordfence.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.33.1]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Formidable Forms \u2013 WordPress Form Builder for Contact Forms, Calculators, Quizzes & More", "source": "cna", "vendor": "strategy11team"}, "product": "formidable_forms_\u2013_wordpress_form_builder_for_contact_forms,_calculators,_quizzes_&_more", "vendor": "strategy11team"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "wordpress", "vendor": "wordpress"}], "created": "2026-08-26T08:00:03.100182+00:00", "updated": "2026-08-28T20:33:49.106265+00:00", "vendors": ["strategy11team", "strategy11team$PRODUCT$formidable_forms_\u2013_wordpress_form_builder_for_contact_forms,_calculators,_quizzes_&_more", "wordpress", "wordpress$PRODUCT$wordpress"]}