BoidCMS is an open-source, PHP-based flat-file CMS for building simple websites and blogs, using JSON as its database. Versions prior to 2.1.3 are vulnerable to a critical Local File Inclusion (LFI) attack via the tpl parameter, which can lead to Remote Code Execution (RCE).The application fails to sanitize the tpl (template) parameter during page creation and updates. This parameter is passed directly to a require_once() statement without path validation. An authenticated administrator can exploit this by injecting path traversal sequences (../) into the tpl value to escape the intended theme directory and include arbitrary files — specifically, files from the server's media/ directory. When combined with the file upload functionality, this becomes a full RCE chain: an attacker can first upload a file with embedded PHP code (e.g., disguised as image data), then use the path traversal vulnerability to include that file via require_once(), executing the embedded code with web server privileges. This issue has been fixed in version 2.1.3.

BoidCMS is a free and open-source flat file CMS for building simple websites and blogs, developed using PHP and uses JSON as a database. In affected versions a reflected Cross-site Scripting (XSS) vulnerability exists in the /admin?page=media endpoint in the file parameter, allowing an attacker to inject arbitrary JavaScript code. This code could be used to steal the user's session cookie, perform phishing attacks, or deface the website. This issue has been addressed in version 2.1.2 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

A cross-site scripting (XSS) vulnerability in the Create Page of Boid CMS v2.1.0 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the Content parameter.

A cross-site scripting (XSS) vulnerability in the Create Page of Boid CMS v2.1.0 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the Permalink parameter.

BoidCMS 2.0.1 is vulnerable to Multiple Stored Cross-Site Scripting (XSS) issues via the title, subtitle, footer, or keywords parameter in a page=create action.

File Upload vulnerability in BoidCMS v.2.0.0 allows a remote attacker to execute arbitrary code by adding a GIF header to bypass MIME type checks.