{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-0740/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":9.8,"id":"CVE-2026-0740"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["wordpress","file-upload","rce","CVE-2026-0740"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eThe Ninja Forms - File Uploads plugin for WordPress, specifically versions up to and including 3.3.26, contains an arbitrary file upload vulnerability (CVE-2026-0740). This flaw stems from a lack of proper file type validation within the \u003ccode\u003eNF_FU_AJAX_Controllers_Uploads::handle_upload\u003c/code\u003e function. An unauthenticated attacker can exploit this vulnerability to upload arbitrary files to the affected WordPress server. Successful exploitation could enable remote code execution, allowing the attacker to compromise the web server and potentially the underlying network. The vulnerability was partially addressed in version 3.3.25 and fully resolved in version 3.3.27. This vulnerability poses a significant risk to organizations using the vulnerable plugin, potentially leading to data breaches, website defacement, or complete system compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn unauthenticated attacker sends a crafted HTTP POST request to the WordPress server targeting the \u003ccode\u003ewp-admin/admin-ajax.php\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe POST request includes a malicious file disguised as a legitimate file type, exploiting the missing file type validation in the \u003ccode\u003eNF_FU_AJAX_Controllers_Uploads::handle_upload\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003ehandle_upload\u003c/code\u003e function processes the request without properly validating the file type, allowing the malicious file to be uploaded to the server.\u003c/li\u003e\n\u003cli\u003eThe uploaded file is stored in the WordPress uploads directory, typically located within the \u003ccode\u003ewp-content/uploads/ninja-forms-uploads/\u003c/code\u003e directory.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts the malicious file (e.g., a PHP script) to execute arbitrary code on the server when accessed.\u003c/li\u003e\n\u003cli\u003eThe attacker accesses the uploaded malicious file via a direct HTTP request to the file\u0026rsquo;s location within the uploads directory.\u003c/li\u003e\n\u003cli\u003eThe web server executes the malicious file (e.g., a PHP script), granting the attacker the ability to execute arbitrary commands on the server.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the executed code to gain a persistent foothold on the server, install malware, or exfiltrate sensitive data.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-0740 allows unauthenticated attackers to upload arbitrary files, potentially leading to remote code execution. This can result in complete compromise of the WordPress website, including data breaches, website defacement, and installation of backdoors. The impact is significant due to the widespread use of WordPress and the Ninja Forms plugin. Even a single successful attack can lead to substantial financial losses, reputational damage, and legal liabilities. Websites utilizing versions of the Ninja Forms File Uploads plugin prior to 3.3.27 are vulnerable.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade the Ninja Forms File Uploads plugin to version 3.3.27 or later to fully patch CVE-2026-0740.\u003c/li\u003e\n\u003cli\u003eImplement web application firewall (WAF) rules to detect and block malicious file upload attempts targeting the \u003ccode\u003ewp-admin/admin-ajax.php\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eMonitor web server access logs for suspicious requests to the \u003ccode\u003ewp-content/uploads/ninja-forms-uploads/\u003c/code\u003e directory.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect Ninja Forms Arbitrary File Upload Attempt\u0026rdquo; to identify potential exploitation attempts in web server logs.\u003c/li\u003e\n\u003cli\u003eEnforce strict file type validation on all file upload forms, even after upgrading the plugin, as a defense-in-depth measure.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-07T05:16:06Z","date_published":"2026-04-07T05:16:06Z","id":"/briefs/2026-04-ninja-forms-rce/","summary":"The Ninja Forms File Uploads plugin for WordPress is vulnerable to unauthenticated arbitrary file uploads due to missing file type validation, potentially leading to remote code execution.","title":"Ninja Forms File Upload Plugin Vulnerability Leads to RCE","url":"https://feed.craftedsignal.io/briefs/2026-04-ninja-forms-rce/"}],"language":"en","title":"CraftedSignal Threat Feed — CVE-2026-0740","version":"https://jsonfeed.org/version/1.1"}