Silverstripe Mimevalidator vulnerabilities

CVE-2020-9309 [HIGH] CWE-434 CVE-2020-9309: Silverstripe CMS through 4.5 can be susceptible to script execution from malicious upload contents u Silverstripe CMS through 4.5 can be susceptible to script execution from malicious upload contents under allowed file extensions (for example HTML code in a TXT file). When these files are stored as protected or draft files, the MIME detection can cause browsers to execute the file contents. Uploads stored as protected or draft files are allowed by defa