Found the error Not allowed to load local resource: file:///etc/passwd while looking at infosec.pub’s communities page. There’s a community called “ignore me” that adds a few image tags trying to steal your passwd file.
You have to be extremely poorly configured for this to work, but the red flags you see should keep you on your toes for the red flags you don’t.
While this is concerning, I wonder what the author(s) of this were thinking would happen. I assume it’s supposed to be an attempt at stealing the server’s passwords, since I at least know of no browser that freely allows access to local files.