CVE-2026-4406

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Gravity Forms", "vendor": "Gravity Forms", "versions": [{"lessThanOrEqual": "2.9.30", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@wordfence.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The Gravity Forms plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the `form_ids` parameter in the `gform_get_config` AJAX action in all versions up to, and including, 2.9.30. This is due to the `GFCommon::send_json()` method outputting JSON-encoded data wrapped in HTML comment delimiters using `echo` and `wp_die()`, which serves the response with a `Content-Type: text/html` header instead of `application/json`. The `wp_json_encode()` function does not HTML-encode angle brackets within JSON string values, allowing injected HTML/script tags in `form_ids` array values to be parsed and executed by the browser. The required `config_nonce` is generated with `wp_create_nonce('gform_config_ajax')` and is publicly embedded on every page that renders a Gravity Forms form, making it identical for all unauthenticated visitors within the same 12-hour nonce tick. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. This vulnerability cannot be exploited against users who are authenticated on the target system, but could be used to alter the target page."}, {"lang": "es", "value": "El plugin Gravity Forms para WordPress es vulnerable a cross-site scripting reflejado a trav\u00e9s del par\u00e1metro 'form_ids' en la acci\u00f3n AJAX 'gform_get_config' en todas las versiones hasta la 2.9.30, inclusive. Esto se debe a que el m\u00e9todo 'GFCommon::send_json()' genera datos codificados en JSON envueltos en delimitadores de comentarios HTML utilizando 'echo' y 'wp_die()', lo que sirve la respuesta con una cabecera 'Content-Type: text/html' en lugar de 'application/json'. La funci\u00f3n 'wp_json_encode()' no codifica en HTML los corchetes angulares dentro de los valores de cadena JSON, permitiendo que las etiquetas HTML/script inyectadas en los valores del array 'form_ids' sean analizadas y ejecutadas por el navegador. El 'config_nonce' requerido se genera con 'wp_create_nonce( gform_config_ajax )' y est\u00e1 incrustado p\u00fablicamente en cada p\u00e1gina que renderiza un formulario de Gravity Forms, haci\u00e9ndolo id\u00e9ntico para todos los visitantes no autenticados dentro del mismo ciclo de nonce de 12 horas. Esto hace posible que atacantes no autenticados inyecten scripts web arbitrarios en p\u00e1ginas que se ejecutan si logran enga\u00f1ar a un usuario para que realice una acci\u00f3n como hacer clic en un enlace. Esta vulnerabilidad no puede ser explotada contra usuarios que est\u00e1n autenticados en el sistema objetivo, pero podr\u00eda usarse para alterar la p\u00e1gina objetivo."}], "id": "CVE-2026-4406", "lastModified": "2026-07-24T23:10:00.563", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 2.7, "source": "security@wordfence.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4406", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-08T15:15:11.294642Z", "version": "2.0.3"}}]}, "published": "2026-04-08T00:16:05.490", "references": [{"source": "security@wordfence.com", "url": "https://docs.gravityforms.com/gravityforms-change-log/"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/common.php#L8267"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/class-gf-config-collection.php#L56"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/class-gf-config-service-provider.php#L144"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/items/class-gf-config-global.php#L22"}, {"source": "security@wordfence.com", "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/4126d452-65a9-48f5-a3f5-5be1b8fff80c?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": "[0,2.9.30]"}}], "enrichment": {"confidence": 98.0, "confidence_source": "matching", "scores": [{"score": 98.0, "source": "matching"}]}, "original": {"product": "Gravity Forms", "source": "cna", "vendor": "Gravity Forms"}, "product": "gravity_forms", "vendor": "gravityforms"}, {"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"}], "analysis": {"en": {"generated_at": "2026-04-08T00:21:00.549741+00:00", "value": {"mitigation_remediation": ["Upgrade Gravity Forms to version 2.9.31 or later", "Remove or disable the Gravity Forms plugin if an upgrade is not immediately possible", "Verify that the site no longer exposes the gform_get_config AJAX endpoint by scanning URLs"], "summary": {"action": "Patch Now", "impact": "Reflected Cross\u2011Site Scripting (XSS)"}, "threat_synthesis": {"affected_systems": "All installations of Gravity Forms version 2.9.30 or earlier on WordPress sites are affected. The plugin exposes the AJAX action on any page that renders a form, and the client\u2011side nonce is identical across users, giving the flaw access to every unauthenticated visitor.", "description_and_impact": "An attacker can embed malicious script tags into the form_ids parameter of the gform_get_config AJAX endpoint. Because the JSON response is served with a text/html content type and the JSON encoder does not escape angle brackets, the browser interprets the injected tags and executes the script. This reflected XSS flaw (CWE\u201179) allows unauthenticated users to trick anyone visiting a Gravity Forms page into running arbitrary JavaScript, potentially defacing the page or exfiltrating data.", "risk_and_exploitability": "With a CVSS score of 4.7 the vulnerability is of moderate severity, largely due to its limited scope and the need for user interaction. EPSS data is unavailable and the flaw is not catalogued by CISA, indicating limited public exploitation to date. Attackers can craft a malicious link that triggers the vulnerable AJAX call, and because the response is not properly escaped once the user clicks, exploitation becomes trivial provided the user follows the link. The overall risk remains moderate but is still actionable."}}}}, "created": "2026-04-08T19:33:47.733572+00:00", "updated": "2026-04-08T19:45:07.062363+00:00", "vendors": ["gravityforms", "gravityforms$PRODUCT$gravity_forms", "wordpress", "wordpress$PRODUCT$wordpress"]}