Extension Blacklist Bypass

Kunstmaan CMS MediaBundle is vulnerable to an Extension Blacklist Bypass. The vulnerability is due to a case‑sensitive blacklist check performed in FileHandler::getFilePath and the subsequent lower‑casing of the stored extension, where an attacker can upload a file with a mixed‑case executable...

Kunstmaan CMS: MediaBundle extension blacklist bypass allows authenticated administrators to upload executable PHP files leading to remote code execution

Summary The MediaBundle blocks dangerous upload extensions with a blacklist that was matched case-sensitively, while the stored filename was lowercased afterwards. A file uploaded as webshell.pHp therefore bypassed the blacklist and was written to the web-accessible upload directory as...

GHSA-P279-5WCV-45VQ Kunstmaan CMS: MediaBundle extension blacklist bypass allows authenticated administrators to upload executable PHP files leading to remote code execution

Summary The MediaBundle blocks dangerous upload extensions with a blacklist that was matched case-sensitively, while the stored filename was lowercased afterwards. A file uploaded as webshell.pHp therefore bypassed the blacklist and was written to the web-accessible upload directory as...