CVE-2026-5436

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "MW WP Form", "vendor": "inc2734", "versions": [{"lessThanOrEqual": "5.1.1", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@wordfence.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The MW WP Form plugin for WordPress is vulnerable to Arbitrary File Move/Read in all versions up to and including 5.1.1. This is due to insufficient validation of the $name parameter (upload field key) passed to the generate_user_file_dirpath() function, which uses WordPress's path_join() \u2014 a function that returns absolute paths unchanged, discarding the intended base directory. The attacker-controlled key is injected via the mwf_upload_files[] POST parameter, which is loaded into the plugin's Data model via _set_request_valiables(). During form processing, regenerate_upload_file_keys() iterates over these keys and calls generate_user_filepath() with the attacker-supplied key as the $name argument \u2014 the key survives validation because the targeted file (e.g., wp-config.php) genuinely exists at the absolute path. The _get_attachments() method then re-reads the same surviving keys and passes the resolved file path to move_temp_file_to_upload_dir(), which calls rename() to move the file into the uploads folder. This makes it possible for unauthenticated attackers to move arbitrary files on the server, which can easily lead to remote code execution when the right file is moved (such as wp-config.php). The vulnerability is only exploitable if a file upload field is added to the form and the \u201cSaving inquiry data in database\u201d option is enabled."}, {"lang": "es", "value": "El plugin MW WP Form para WordPress es vulnerable a Movimiento/Lectura Arbitraria de Archivos en todas las versiones hasta la 5.1.1 inclusive. Esto se debe a una validaci\u00f3n insuficiente del par\u00e1metro $name (clave del campo de carga) pasado a la funci\u00f3n generate_user_file_dirpath(), que utiliza path_join() de WordPress - una funci\u00f3n que devuelve rutas absolutas sin cambios, descartando el directorio base previsto. La clave controlada por el atacante se inyecta a trav\u00e9s del par\u00e1metro POST mwf_upload_files[], que se carga en el modelo de Datos del plugin a trav\u00e9s de _set_request_valiables(). Durante el procesamiento del formulario, regenerate_upload_file_keys() itera sobre estas claves y llama a generate_user_filepath() con la clave proporcionada por el atacante como argumento $name - la clave sobrevive a la validaci\u00f3n porque el archivo objetivo (p. ej., wp-config.php) existe realmente en la ruta absoluta. El m\u00e9todo _get_attachments() luego vuelve a leer las mismas claves supervivientes y pasa la ruta de archivo resuelta a move_temp_file_to_upload_dir(), que llama a rename() para mover el archivo a la carpeta de cargas. Esto hace posible que atacantes no autenticados muevan archivos arbitrarios en el servidor, lo que puede conducir f\u00e1cilmente a la ejecuci\u00f3n remota de c\u00f3digo cuando se mueve el archivo correcto (como wp-config.php). La vulnerabilidad solo es explotable si se a\u00f1ade un campo de carga de archivos al formulario y la opci\u00f3n 'Guardar datos de consulta en la base de datos' est\u00e1 habilitada."}], "id": "CVE-2026-5436", "lastModified": "2026-07-24T20:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "security@wordfence.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-5436", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-10T20:49:59.187525Z", "version": "2.0.3"}}]}, "published": "2026-04-08T21:17:01.690", "references": [{"source": "security@wordfence.com", "url": "https://github.com/web-soudan/mw-wp-form/commit/f872ab18ca670f5867b2241745daa30cd0fab861"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/mw-wp-form/tags/5.1.1/classes/models/class.data.php#L591"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/mw-wp-form/tags/5.1.1/classes/models/class.directory.php#L138"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/changeset/3501261/mw-wp-form"}, {"source": "security@wordfence.com", "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/bc308993-7fc5-41db-a396-f05e95fe47b8?source=cve"}], "sourceIdentifier": "security@wordfence.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "security@wordfence.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,5.1.1]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "MW WP Form", "source": "cna", "vendor": "inc2734"}, "product": "mw_wp_form", "vendor": "inc2734"}, {"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": "2026-04-08T22:29:06.041047+00:00", "value": {"mitigation_remediation": ["Apply the latest MW WP Form plugin release, which removes the path\u2011validation flaw.", "If an update cannot be applied immediately, deactivate the form\u2019s \"Saving inquiry data in database\" option or remove all upload fields from affected forms.", "When staying on older versions, restrict file uploads to approved MIME types and validate file names against a whitelist to prevent absolute paths.", "Monitor web server logs for unexpected file rename or move operations that could indicate exploitation attempts.", "Implement general WordPress hardening practices, such as limiting upload directory permissions and reviewing user capabilities to reduce overall risk."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "All installations of the inc2734 MW WP Form plugin that are version 5.1.1 or earlier. An attack is possible only when the form contains at least one file upload field and the \"Saving inquiry data in database\" setting is enabled. The vulnerability applies to any WordPress site that uses such a form and has not yet applied the official update.", "description_and_impact": "The MW WP Form plugin for WordPress contains a flaw that lets an unauthenticated attacker move any file on the server. The problem occurs because the plugin does not properly validate the file key supplied in the mwf_upload_files[] POST parameter; the path resolution routine keeps an absolute path and later a rename operation copies the file into the uploads directory. An attacker can therefore relocate sensitive files, such as wp-config.php, into a web\u2011exposed folder and enable further exploitation. This weakness is a classic Arbitrary File Move (CWE\u201122) and can result in remote code execution when critical files are moved to publicly accessible locations.", "risk_and_exploitability": "The flaw carries a CVSS score of 8.1, indicating a high severity vulnerability, and is marked as unauthenticated, meaning no user credentials are required. While an EPSS score is not currently available and the vulnerability has not yet been listed in the CISA KEV catalog, the straightforward exploitation path\u2014sending a crafted POST request with an absolute file key\u2014makes the risk significant. Attackers could move privileged files, expose them via the uploads directory, and potentially execute remote code. Environmental factors such as the presence of a file upload field and the database\u2011saving option are the only prerequisites for exploitation."}}}}, "created": "2026-04-09T08:17:56.554082+00:00", "updated": "2026-04-09T08:27:20.037422+00:00", "vendors": ["inc2734", "inc2734$PRODUCT$mw_wp_form", "wordpress", "wordpress$PRODUCT$wordpress"]}