When being moved, any territory claimed by a station will remain claimed, even if the station is moved outside of the claimed system.
The faction-module on the station can then be used to claim the system of the new location, if unclaimed before.
When the station is then "destroyed" [only destroying or removing the faction-module is sufficient], the claimed territory the station is currently located in is unclaimed, any other territory claimed using that station using the previous exploit will remain claimed, and the claim will no be removable by any currently known means to standard players.
This is especially bad, if the server offers access to sector-teleportation commands for specific non-administrator players, e.g. donors or similar.
To reproduce:
# Spawn a station
# Place a build-block and a faction-module on said station.
# Join or found a faction (this step may be done as first step)
# Enter the faction-signature into the faction-module on the station
# Claim the system using the station'd faction-module
# Enter the build-block
# Use /change_sector (or get another player or script-wrapper to use /change_sector_for on you) to teleport to a different unclaimed system
# Use the galaxy map to observe the original system is still claimed
# Open the faction-module's menu, and observe as you can claim the current system, without revoking the original system
# Claim the current system
# Use the galaxy map to observe, that both systems are now claimed.
# (Optional) Goto step 6 and repeat the process to claim ever more systems
# Remove or destroy the faction-module on the station
# Observe as only the system the station is currently in is unclaimed, while all the previous systems claimed using this exploit remain claimed, and cannot be revoked without using admin-commands by any player.