WDMyCloud Multiple Vulnerabilities
Generally when it's something this obvious I think it's a backdoor for debugging that got left in due to bad development practices. [1]If someone actually wanted to implant a "secret" backdoor it would be disguised as a subtle bug and/or obfuscated in some way."Never attribute to malice that which is adequately explained by stupidity." Hanlon's Razor -
 https://en.wikipedia.org/wiki/Hanlon%27s_razor[1] "[...] it turns out the error was caused due to buggy code and nothing I was or wasn't doing wrong." - if the code is so obviously buggy and the backdoor part isn't obviously a bug, the developers are probably just being sloppy, not malicious (bad or rushed development).