Describe the nature of this bug.
Opening a door just as the last person ends so the screen closes and you can end the dungeon again to get double exp (Along with similar methods)? Jagex is well aware of this, but they can't ban unless you admit to doing it. Their systems only detect that everyone in the party received double experience, not who caused it to happen.
^It's possible that was patched since I last did it.
Using the door glitch to get through doors without doing the puzzle? Most likely a ban.
Glitching portal rooms? Temp ban if you admit to it.
Glitching mercenary rooms? Temp ban if you admit to it.
Safespotting the Dreadnaut and Hope Devourer? Not a bug though even some pmods seem to think it is.
Glitching yourself outside of the walls of a dungeon, entering someone else's dungeon, and ending with them? Definite Perm Ban.