{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/products/the-welcomizer--2.8.1/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":["cpe:2.3:a:the_welcomizer_project:the_welcomizer:*:*:*:*:*:wordpress:*:*"],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-4327"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["The Welcomizer (\u003c= 2.8.1)"],"_cs_severities":["high"],"_cs_tags":["wordpress","plugin-vulnerability","rce"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eThe Welcomizer plugin for WordPress is vulnerable to Remote Code Execution (RCE) in all versions up to and including 2.8.1. The flaw exists within the twiz_ajax_callback AJAX action, specifically in the 'savesection' handler, which fails to implement necessary authorization checks. Although the handler verifies a nonce, the required nonce value is easily retrievable by any authenticated user via the directly accessible twiz-ajax.js.php file.\u003c/p\u003e\n\u003cp\u003eOnce an attacker obtains the nonce, they can perform an authenticated AJAX request to the server. The handler processes user-supplied 'custom logic' through an eval() function call without validating the user's permissions via current_user_can(). This allows an attacker with a low-privilege account, such as a WordPress Subscriber, to inject and execute arbitrary PHP code on the server, leading to potential full site compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker authenticates to the WordPress site as a Subscriber-level user.\u003c/li\u003e\n\u003cli\u003eAttacker sends an HTTP GET request to /wp-content/plugins/the-welcomizer/twiz-ajax.js.php to extract the active session nonce.\u003c/li\u003e\n\u003cli\u003eAttacker crafts an HTTP POST request targeting the AJAX endpoint, typically /wp-admin/admin-ajax.php.\u003c/li\u003e\n\u003cli\u003eAttacker includes the 'action' parameter set to 'twiz_ajax_callback' and the 'savesection' sub-action.\u003c/li\u003e\n\u003cli\u003eAttacker includes the previously harvested nonce in the request to bypass the initial check.\u003c/li\u003e\n\u003cli\u003eAttacker injects malicious PHP code into the 'twiz_custom_logic' parameter while setting the 'twiz_logic_output' option.\u003c/li\u003e\n\u003cli\u003eThe server-side script executes the attacker-supplied code via the insecure eval() function.\u003c/li\u003e\n\u003cli\u003eAttacker achieves remote code execution within the context of the web server process.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation allows an authenticated user with minimal privileges to execute arbitrary code on the web server. This can lead to complete site takeover, unauthorized access to database contents, modification of site configuration, or use of the server as a pivot point for further lateral movement within the target organization's infrastructure.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eImmediately update the 'The Welcomizer' plugin to the latest available version beyond 2.8.1.\u003c/li\u003e\n\u003cli\u003eIf an update is unavailable, disable the plugin until a patch is applied.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rules below to your web server logs to monitor for attempts to trigger the vulnerable 'savesection' AJAX handler.\u003c/li\u003e\n\u003cli\u003eReview WordPress user accounts and audit subscriber-level activity for unauthorized access to the twiz-ajax.js.php endpoint.\u003c/li\u003e\n\u003c/ol\u003e\n","date_modified":"2026-09-19T10:11:11Z","date_published":"2026-09-19T10:11:11Z","id":"https://feed.craftedsignal.io/briefs/2026-09-welcomizer-rce/","summary":"The Welcomizer WordPress plugin contains a remote code execution vulnerability allowing authenticated subscribers to inject arbitrary PHP code via an insufficiently protected AJAX handler.","title":"CVE-2026-4327: Remote Code Execution in The Welcomizer WordPress Plugin","url":"https://feed.craftedsignal.io/briefs/2026-09-welcomizer-rce/"}],"language":"en","title":"CraftedSignal Threat Feed - The Welcomizer (\u003c= 2.8.1)","version":"https://jsonfeed.org/version/1.1"}