Upcasted S3 Offload – AWS S3, Digital Ocean Spaces, Backblaze, Minio and more <= 3.0.3 - Authenticated (Subscriber+) Stored Cross-Site Scripting

The Upcasted S3 Offload – AWS S3, Digital Ocean Spaces, Backblaze, Minio and more plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 3.0.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.