CyberRota Analysis
AI-GeneratedThe vulnerability affects Kirby's REST API, specifically its chunk upload handler, allowing authenticated users with limited permissions to exploit the system by submitting incomplete file uploads. This can lead to excessive consumption of temporary storage, potentially disrupting other users' ability to upload files and impacting site functionality. Organizations using affected versions (5.0.0 to 5.5.2) should prioritize updating to version 5.5.2 to mitigate these risks.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Kirby is an open-source content management system. From 5.0.0 until 5.5.2, Kirby's REST API chunk upload handler in src/Api/Upload.php did not run the relevant upload authorization preflight in Kirby\Api\Upload::process() before Kirby\Api\Upload::processChunk() persisted chunk data. An authenticated user with the access.panel permission enabled but with files.create, files.replace, and user/users.update permissions disabled could submit requests with an Upload-Length header and leave unfinished chunks in site/cache/.uploads for 24 hours. Repeating this process could consume attacker-controlled temporary storage, prevent other users from uploading files, or prevent site logic from storing data, although final permission checks still prevented unauthorized files from reaching the content or site/accounts directories. This issue is fixed in version 5.5.2.