{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/the-swiss-toolkit-for-wp-plugin--1.4.7/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-2354"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["The Swiss Toolkit For WP plugin (\u003c 1.4.7)","WordPress"],"_cs_severities":["critical"],"_cs_tags":["wordpress","plugin","file-upload","rce","web-vulnerability"],"_cs_type":"advisory","_cs_vendors":["The Swiss Toolkit For WP"],"content_html":"\u003cp\u003eA critical arbitrary file upload vulnerability, identified as CVE-2026-2354, impacts The Swiss Toolkit For WP plugin for WordPress, affecting all versions up to and including 1.4.6. This flaw resides within the \u003ccode\u003eupload_extension_files()\u003c/code\u003e function, where a flawed file type validation bypass allows authenticated attackers, specifically those with Author-level access or higher, to upload arbitrary files to the affected server. The vulnerability stems from the function's use of \u003ccode\u003estrpos()\u003c/code\u003e to check for configured file extension strings within the filename rather than properly verifying the actual file extension. This oversight enables an attacker to embed malicious scripts, such as PHP files, within seemingly legitimate image files (e.g., \u003ccode\u003eimage.avif.php\u003c/code\u003e). Successful exploitation, contingent on the \u0026quot;Enhanced Multi-Format Image Support\u0026quot; feature being enabled with at least one configured extension, can lead to remote code execution (RCE) and full compromise of the WordPress site and its underlying server.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eInitial Access\u003c/strong\u003e: An attacker obtains valid credentials for a WordPress account with Author-level privileges or higher on a site running the vulnerable \u003ccode\u003eThe Swiss Toolkit For WP\u003c/code\u003e plugin.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eVulnerability Identification\u003c/strong\u003e: The attacker identifies that \u003ccode\u003eThe Swiss Toolkit For WP\u003c/code\u003e plugin (versions \u0026lt;= 1.4.6) is installed and the \u0026quot;Enhanced Multi-Format Image Support\u0026quot; feature is enabled.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eMalicious File Crafting\u003c/strong\u003e: The attacker creates a malicious PHP file, such as a webshell, and renames it with a double extension (e.g., \u003ccode\u003ewebshell.avif.php\u003c/code\u003e) to bypass the plugin's \u003ccode\u003estrpos()\u003c/code\u003e-based file type validation.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eArbitrary File Upload\u003c/strong\u003e: The attacker sends an HTTP POST request to a WordPress file upload endpoint, leveraging the \u003ccode\u003eupload_extension_files()\u003c/code\u003e function's weakness to upload the specially crafted \u003ccode\u003ewebshell.avif.php\u003c/code\u003e file.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eFile Placement\u003c/strong\u003e: Due to the vulnerability, the plugin incorrectly processes and saves the malicious file onto the web server in a publicly accessible directory, typically within \u003ccode\u003ewp-content/uploads/\u003c/code\u003e or the plugin's own directory.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eRemote Code Execution\u003c/strong\u003e: The attacker directly accesses the uploaded malicious file (e.g., \u003ccode\u003ehttps://example.com/wp-content/uploads/webshell.avif.php\u003c/code\u003e) via a web browser, triggering the execution of arbitrary commands on the server.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003ePost-Exploitation Activity\u003c/strong\u003e: With remote code execution established, the attacker can establish persistence, exfiltrate sensitive data, deface the website, or pivot to other systems within the network.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eA successful exploitation of CVE-2026-2354 leads to complete compromise of the affected WordPress instance. Attackers can achieve remote code execution, granting them full control over the website, its content, and potentially the underlying web server. This can result in data theft (e.g., user databases, sensitive configuration files), website defacement, injection of malware into web pages affecting visitors, or the use of the compromised server as a platform for further attacks on other systems. The CVSS v3.1 Base Score of 8.8 indicates a critical severity, reflecting the high impact on confidentiality, integrity, and availability.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003ePatch Immediately\u003c/strong\u003e: Upgrade The Swiss Toolkit For WP plugin to version 1.4.7 or higher to address CVE-2026-2354.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eMonitor Web Server Logs\u003c/strong\u003e: Deploy the Sigma rule \u0026quot;Detect CVE-2026-2354 Exploitation Attempt - The Swiss Toolkit For WP Plugin Arbitrary File Upload\u0026quot; to your SIEM system and monitor web server access logs for suspicious POST requests containing double extensions indicative of arbitrary file upload attempts.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eReview File Upload Configurations\u003c/strong\u003e: Review and restrict file upload capabilities in WordPress, ensuring that only necessary file types can be uploaded and that server-side validation is robust.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eLeast Privilege\u003c/strong\u003e: Ensure WordPress user accounts adhere to the principle of least privilege; restrict Author-level (and higher) access to trusted users only.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-07-11T05:19:38Z","date_published":"2026-07-11T05:19:38Z","id":"https://feed.craftedsignal.io/briefs/2026-07-the-swiss-toolkit-for-wp-rce/","summary":"A critical arbitrary file upload vulnerability (CVE-2026-2354) exists in The Swiss Toolkit For WP plugin for WordPress, affecting all versions up to and including 1.4.6. The flaw, located in the `upload_extension_files()` function, allows authenticated attackers with Author-level access or higher to bypass file type validation due to an improper `strpos()` check, enabling the upload of arbitrary files, including PHP scripts, which can lead to remote code execution on the server if the \"Enhanced Multi-Format Image Support\" feature is active with at least one configured extension.","title":"The Swiss Toolkit For WP Plugin Vulnerable to Arbitrary File Upload Leading to RCE (CVE-2026-2354)","url":"https://feed.craftedsignal.io/briefs/2026-07-the-swiss-toolkit-for-wp-rce/"}],"language":"en","title":"CraftedSignal Threat Feed - The Swiss Toolkit for WP Plugin (\u003c 1.4.7)","version":"https://jsonfeed.org/version/1.1"}