In ConvertX before 0.19.0, converters/calibre.ts does not block recipe files, and instead passes them to the ebook-convert program from Calibre. This affects executable code in a .recipe or .downloadedrecipe file.

ConvertXis a self-hosted online file converter. In versions prior to 0.16.0, the endpoint /upload allows an authenticated user to write arbitrary files on the system, overwriting binaries and allowing code execution. The upload function takes file.name directly from user supplied data without doing any sanitization on the name thus allowing for arbitrary file write. This can be used to overwrite system binaries with ones provided from an attacker allowing full code execution. Version 0.16.0 contains a patch for the issue.

ConvertXis a self-hosted online file converter. In versions prior to 0.17.0, the POST /delete endpoint uses a user-controlled filename value to construct a filesystem path and deletes it via unlink without sufficient validation. By supplying path traversal sequences (e.g., ../), an attacker can delete arbitrary files outside the intended uploads directory, limited only by the permissions of the server process. Version 0.17.0 fixes the issue.