Bludit CMS before version 3.18.4 allows Remote Code Execution (RCE) via the API Plugin. The POST /api/files/{key} endpoint in bl-plugins/api/plugin.php fails to perform authorization checks and lacks file extension validation. An attacker with a valid API token can upload a malicious PHP script and execute arbitrary code on the server.

Bludit CMS through 3.22.0 contains a missing authorization vulnerability that allows authenticated users holding the Author or Editor role to read the full content of private drafts and scheduled posts belonging to any other user, including administrators, by exploiting the content-get-list AJAX endpoint in bl-kernel/ajax/content-get-list.php. Attackers can send an authenticated GET request to the admin AJAX endpoint with the draft parameter set to true, triggering getList() without ownership constraints and returning serialized page objects site-wide, exposing pre-publication material and sensitive notes stored in administrator-owned drafts.

Bludit CMS through 3.22.0 contains a mass assignment vulnerability that allows authenticated users with the Author role to modify privileged page fields reserved for administrators by injecting reserved parameters into a content save request. Attackers can submit reserved fields such as type and username through the Pages::edit() function in bl-kernel/pages.class.php, which iterates all fields declared in dbFields without per-field authorization, enabling an Author to convert pages to static site-wide navigation entries or transfer page ownership to arbitrary accounts.

Bludit CMS through 3.22.0 contains an authorization bypass vulnerability that allows authenticated users with the Author role to enumerate and delete media files belonging to pages owned by other users, including administrators, by supplying arbitrary uuid parameters to unprotected AJAX endpoints. Attackers can retrieve page UUIDs for all users via the content-get-list endpoint and then submit crafted POST requests to the list-images and delete-image endpoints in bl-kernel/ajax/ to access and destroy media files outside their own pages, bypassing the IMAGERESTRICT isolation control.

Bludit CMS prior to commit 6732dde contains a reflected cross-site scripting vulnerability in the search plugin that allows unauthenticated attackers to inject arbitrary JavaScript by crafting a malicious search query. Attackers can execute malicious scripts in the browsers of users who visit crafted URLs containing the payload, potentially stealing session cookies or performing actions on behalf of affected users.