Impact Originally reported in iTXTech/Genisys#1188 PotterHarry98 potterharry98 "deop PotterHarry98" will remove "potterharry98" from the ops.txt but not "PotterHarry98". Operator permissions are checked using "Config->exists()" with "lowercase=true", which will result in a match: https://github.com/pmmp/PocketMine-MP/blob/22bb1ce8e03dba57173debf0415390511d68e045/src/utils/Config.php#L449 This means that it's possible to make yourself impossible to de-op (using commands) by adding your name to ops.txt with uppercase letters. Patches 4d37b79ff7f9d9452e988387f97919a9a1c4954e Workarounds This can be easily addressed by removing the offending lines from ops.txt manually. For more information If you have any questions or comments about this advisory: * Open an issue in "pmmp/PocketMine-MP" (https://github.com/pmmp/PocketMine-MP) * Email us at "team@pmmp.io" (mailto:team@pmmp.io)