World-Writable
From Support
A world-writable file or directory is one that anyone can alter. For directories this means that anyones files can be created or deleted within it. Being world-writable is almost always a security risk.
> ls -l
-rw-rw-rw- 1 bbrazil bbrazil 0 Dec 25 20:08 file
^ this w indicates that 'file' is world-writable
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