{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/gutenbee--gutenberg-blocks-plugin--2.20.1/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-9227"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["GutenBee – Gutenberg Blocks plugin \u003c= 2.20.1"],"_cs_severities":["high"],"_cs_tags":["arbitrary-file-upload","remote-code-execution","wordpress"],"_cs_type":"advisory","_cs_vendors":["WordPress"],"content_html":"\u003cp\u003eCVE-2026-9227 describes an arbitrary file upload vulnerability affecting the GutenBee – Gutenberg Blocks plugin for WordPress in versions up to and including 2.20.1. The vulnerability resides in the \u003ccode\u003egutenbee_file_and_ext_json\u003c/code\u003e function, which implements a flawed file extension validation check. Specifically, the code uses \u003ccode\u003estrpos()\u003c/code\u003e to check if the filename contains \u0026lsquo;.json\u0026rsquo;, but fails to verify that the filename actually ends with \u0026lsquo;.json\u0026rsquo;. This allows attackers to bypass the intended validation by using double extensions such as \u0026lsquo;shell.json.php\u0026rsquo;. An attacker must be authenticated with author-level privileges or higher to exploit this vulnerability. Successful exploitation allows the attacker to upload arbitrary files, including executable scripts, leading to remote code execution on the vulnerable WordPress server.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker authenticates to the WordPress site with author-level or higher privileges.\u003c/li\u003e\n\u003cli\u003eThe attacker navigates to a page or post editing interface where the GutenBee plugin\u0026rsquo;s file upload functionality is available.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious file with a double extension, such as \u003ccode\u003eshell.json.php\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe attacker uses the GutenBee plugin\u0026rsquo;s file upload functionality to upload the crafted file. The flawed \u003ccode\u003estrpos()\u003c/code\u003e check in \u003ccode\u003egutenbee_file_and_ext_json\u003c/code\u003e incorrectly validates the file extension.\u003c/li\u003e\n\u003cli\u003eThe file is uploaded to the WordPress uploads directory.\u003c/li\u003e\n\u003cli\u003eThe attacker accesses the uploaded file via a direct HTTP request to the file\u0026rsquo;s location.\u003c/li\u003e\n\u003cli\u003eThe web server executes the PHP code within the uploaded file.\u003c/li\u003e\n\u003cli\u003eThe attacker achieves remote code execution on the WordPress server.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-9227 allows an authenticated attacker with author-level access or higher to execute arbitrary code on the target WordPress server. This can lead to complete compromise of the server, including data theft, website defacement, or further malicious activities. The vulnerability affects all WordPress sites using the GutenBee plugin with versions 2.20.1 or lower, potentially impacting a wide range of websites.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade the GutenBee – Gutenberg Blocks plugin to the latest version to patch CVE-2026-9227.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect CVE-2026-9227 GutenBee Arbitrary File Upload Attempt\u0026rdquo; to your SIEM to detect potential exploitation attempts in web server logs.\u003c/li\u003e\n\u003cli\u003eImplement stricter file extension validation on the server-side to prevent similar arbitrary file upload vulnerabilities.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-28T08:19:37Z","date_published":"2026-05-28T08:19:37Z","id":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-9227-gutenbee-upload/","summary":"The GutenBee – Gutenberg Blocks plugin for WordPress is vulnerable to arbitrary file upload, allowing authenticated attackers with author-level access to achieve remote code execution by uploading executable files with double extensions.","title":"CVE-2026-9227: GutenBee WordPress Plugin Arbitrary File Upload","url":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-9227-gutenbee-upload/"}],"language":"en","title":"CraftedSignal Threat Feed — GutenBee – Gutenberg Blocks Plugin \u003c= 2.20.1","version":"https://jsonfeed.org/version/1.1"}