GHSA-wppf-gqj5-fc4f

REDAXO allows Arbitrary File Upload in the mediapool page

### Summary An arbitrary file upload vulnerability was identified in the redaxo. This flaw permits users to upload malicious files, which can lead to JavaScript code execution and distribute malware. ### Details On the latest version of Redaxo, v5.18.2, the mediapool/media page is vulnerable to arbitrary file upload. ### PoC 1. Log in to the portal then navigate to `Mediapool`. 2. Upload a png file (ex: poc.png)  3. Intercept the upload HTTP request on burp suite and change `filename: poc.1html`, `Content-Type:image/html` and insert the malicious html code. (ex: `<IFRAME SRC="javascript:alert(1);"></IFRAME>`)  4. Forward the request. 5. Navigate to the file.   ### Impact Exploiting an arbitrary file upload vulnerability enables attackers to execute malicious code on a server.