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Start learningUpgrade redaxo/source
to version 5.18.3 or higher.
Affected versions of this package are vulnerable to Arbitrary File Upload via the mediapool/media
page. An attacker can execute malicious code and potentially distribute malware by uploading a file with a modified filename and content-type to masquerade as a benign file type, then tricking a user into navigating to the file to trigger the execution.