Submitted by grearlake, also found by roguereggiant, Breeje, hals, and blutorque
https://github.com/code-423n4/2024-03-abracadabra-money/blob/main/src/mimswap/MagicLP.sol#L470-#L510 
https://github.com/code-423n4/2024-03-abracadabra-money/blob/main/src/mimswap/MagicLP.sol#L244-#L265
Because MagicLP is forked from DODO, we will check DODO documentation to understand this contract. From DODO documentation, the I is the i value in here and it is directly related with the output amount a trader will receive when selling a quote/base token:

Adjusting the value of I directly by calling setParameters() function will influence the price. This can be exploited by a MEV bot, simply by trading just before the setParameters() function and exiting right after the price change. The profit gained from this operation essentially represents potential losses for the liquidity providers who supplied liquidity to the pool.
Since the price will change, the MEV bot can simply sandwich the tx and get profit.
Another note on this is that even though the adjustPrice called by onlyImplementationOwner without getting frontrunned, it still creates a big price difference which requires immediate arbitrages. Usually these type of parameter changes that impacts the trades are setted by time via ramping to mitigate the unfair advantages that it can occur during the price update.
Acknowledge the issue and use private RPCs to eliminate front-running or slowly ramp up the I so that the arbitrage opportunity is fair
0xCalibur (Abracadabra) acknowledged and commented:
