HIGH severity: Stops Transactions. The owner can enable transactions for all users, but once enabled, they cannot be disabled again.

Vulnerable code:
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// Why You Come Here! is Safe Contract 100% ✅

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

interface IBEP20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        _setOwner(_msgSender());
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

interface IFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IRouter {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

library Address {
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}

contract SHYTCOIN is Context, IBEP20, Ownable {
    using Address for address payable;

    mapping(address => uint256) private _rOwned;
    mapping(address => uint256) private _tOwned;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _isExcludedFromFee;
    mapping(address => bool) private _isExcluded;

    address[] private _excluded;

    bool private swapping;
    bool public tradingEnabled;

    IRouter public router;
    address public pair;

    uint8 private constant _decimals = 9;
    uint256 private constant MAX = ~uint256(0);

    uint256 private _tTotal = 100000 * 10**_decimals;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));

    uint256 public swapTokensAtAmount = 10000000000;

    address public deadWallet = 0x000000000000000000000000000000000000dEaD;
    address public marketingWallet = 0x701A4f34A4d0638ecc953AE0DAd68CAF2dcB2b8e;

    string private constant _name = "ShytCoin";
    string private constant _symbol = "SHYTCOIN";

    struct BuyTaxes {
        uint256 rfi;
        uint256 marketing;
    }
    
    struct SellTaxes {
        uint256 rfi;
        uint256 marketing;
    }

    BuyTaxes private taxes = BuyTaxes(0, 5);
    SellTaxes private selltaxes = SellTaxes(0, 5);

    struct TotFeesPaidStruct {
        uint256 rfi;
        uint256 marketing;
    }

    TotFeesPaidStruct public totFeesPaid;

    struct valuesFromGetValues {
        uint256 rAmount;
        uint256 rTransferAmount;
        uint256 rRfi;
        uint256 rMarketing;
        uint256 tTransferAmount;
        uint256 tRfi;
        uint256 tMarketing;
    }

    modifier lockTheSwap() {
        swapping = true;
        _;
        swapping = false;
    }

    constructor(address routerAddress) {
        IRouter _router = IRouter(routerAddress);
        address _pair = IFactory(_router.factory()).createPair(address(this), _router.WETH());

        router = _router;
        pair = _pair;

        excludeFromReward(pair);
        excludeFromReward(deadWallet);

        _rOwned[owner()] = _rTotal;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[marketingWallet] = true;
        _isExcludedFromFee[deadWallet] = true;
        emit Transfer(address(0), owner(), _tTotal);
    }
    
    function enableTrading() external onlyOwner{
        require(!tradingEnabled, "Trading is already enabled");
        tradingEnabled = true;
    }

    function updateBTax(uint256 _rfl, uint256 _marketing) external onlyOwner {
        uint256 _totalBuyFees = _rfl +_marketing;

        require(_totalBuyFees <= 15, "Cannot be total fees higher than 15%");
        taxes.rfi = _rfl;
        taxes.marketing = _marketing;
   
    }

    function updateSTax(uint256 _rfl, uint256 _marketing) external onlyOwner {
        uint256 _totalSellFees = _rfl + _marketing;

        require(_totalSellFees <= 20, "Cannot be total fees higher than 20%");
        selltaxes.rfi = _rfl;
        selltaxes.marketing = _marketing;
        
    }

    //std BEP20:
    function name() public pure returns (string memory) {
        return _name;
    }

    function symbol() public pure returns (string memory) {
        return _symbol;
    }

    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    //override BEP20:
    function totalSupply() public view override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        if (_isExcluded[account]) return _tOwned[account];
        return tokenFromReflection(_rOwned[account]);
    }

    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "BEP20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        returns (bool)
    {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "BEP20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function isExcludedFromReward(address account) public view returns (bool) {
        return _isExcluded[account];
    }


    function reflectionFromToken(uint256 tAmount, bool deductTransferRfi)
        public
        view
        returns (uint256)
    {
        require(tAmount <= _tTotal, "Amount must be less than supply");
        if (!deductTransferRfi) {
            valuesFromGetValues memory s = _getValues(tAmount, true);
            return s.rAmount;
        } else {
            valuesFromGetValues memory s = _getValues(tAmount, true);
            return s.rTransferAmount;
        }
    }

    function tokenFromReflection(uint256 rAmount) public view returns (uint256) {
        require(rAmount <= _rTotal, "Amount must be less than total reflections");
        uint256 currentRate = _getRate();
        return rAmount / currentRate;
    }

    //@dev kept original RFI naming -> "reward" as in reflection
    function excludeFromReward(address account) public onlyOwner {
        require(!_isExcluded[account], "Account is already excluded");
        if (_rOwned[account] > 0) {
            _tOwned[account] = tokenFromReflection(_rOwned[account]);
        }
        _isExcluded[account] = true;
        _excluded.push(account);
    }

    function excludeFromFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = true;
    }

    function isExcludedFromFee(address account) public view returns (bool) {
        return _isExcludedFromFee[account];
    }

    function _reflectRfi(uint256 rRfi, uint256 tRfi) private {
        _rTotal -= rRfi;
        totFeesPaid.rfi += tRfi;
    }


    function _takeMarketing(uint256 rMarketing, uint256 tMarketing) private {
        totFeesPaid.marketing += tMarketing;

        if (_isExcluded[address(this)]) {
            _tOwned[address(this)] += tMarketing;
        }
        _rOwned[address(this)] += rMarketing;
    }


    function _getValues(
        uint256 tAmount,
        bool takeFee
    ) private view returns (valuesFromGetValues memory to_return) {
        to_return = _getTValues(tAmount, takeFee);
        (
            to_return.rAmount,
            to_return.rTransferAmount,
            to_return.rRfi,
            to_return.rMarketing
        ) = _getRValues(to_return, tAmount, takeFee, _getRate());

        return to_return;
    }

    function _getTValues(
        uint256 tAmount,
        bool takeFee
    ) private view returns (valuesFromGetValues memory s) {
        if (!takeFee) {
            s.tTransferAmount = tAmount;
            return s;
        }

        s.tRfi = (tAmount * taxes.rfi) / 100;
        s.tMarketing = (tAmount * taxes.marketing) / 100;
        s.tTransferAmount =
            tAmount -
            s.tRfi -
            s.tMarketing;
        return s;
    }

    function _getRValues(
        valuesFromGetValues memory s,
        uint256 tAmount,
        bool takeFee,
        uint256 currentRate
    )
        private
        pure
        returns (
            uint256 rAmount,
            uint256 rTransferAmount,
            uint256 rRfi,
            uint256 rMarketing
        )
    {
        rAmount = tAmount * currentRate;

        if (!takeFee) {
            return (rAmount, rAmount, 0, 0);
        }

        rRfi = s.tRfi * currentRate;
        rMarketing = s.tMarketing * currentRate;
        rTransferAmount =
            rAmount -
            rRfi -
            rMarketing;
        return (rAmount, rTransferAmount, rRfi, rMarketing);
    }

    function _getRate() private view returns (uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply / tSupply;
    }

    function _getCurrentSupply() private view returns (uint256, uint256) {
        uint256 rSupply = _rTotal;
        uint256 tSupply = _tTotal;
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_rOwned[_excluded[i]] > rSupply || _tOwned[_excluded[i]] > tSupply)
                return (_rTotal, _tTotal);
            rSupply = rSupply - _rOwned[_excluded[i]];
            tSupply = tSupply - _tOwned[_excluded[i]];
        }
        if (rSupply < _rTotal / _tTotal) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) private {
        require(owner != address(0), "BEP20: approve from the zero address");
        require(spender != address(0), "BEP20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        require(from != address(0), "BEP20: transfer from the zero address");
        require(to != address(0), "BEP20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        require(
            amount <= balanceOf(from),
            "You are trying to transfer more than your balance"
        );
        
        if(!_isExcludedFromFee[from] && !_isExcludedFromFee[to]) {
            require(tradingEnabled, "Trading is not enabled yet");
        }

        bool canSwap = balanceOf(address(this)) >= swapTokensAtAmount;
        
        uint256 oldBuyRFI = taxes.rfi;
        uint256 oldBuyMarketing = taxes.marketing;

        if(to == pair){
        
            taxes.rfi = selltaxes.rfi;
            taxes.marketing = selltaxes.marketing;

        }else if(from == pair){
            
            taxes.rfi = taxes.rfi;
            taxes.marketing = taxes.marketing;

        }else{
            taxes.rfi = 0;
            taxes.marketing = 10;
        }


        if (
            !swapping &&
            canSwap &&
            from != pair &&
            !_isExcludedFromFee[from] &&
            !_isExcludedFromFee[to]
        ) {
            swapAndLiquify();
        }
        bool takeFee = true;
        if (swapping || _isExcludedFromFee[from] || _isExcludedFromFee[to]) takeFee = false;

        _tokenTransfer(from, to, amount, takeFee);
        
        taxes.rfi = oldBuyRFI;
        taxes.marketing = oldBuyMarketing;
            
    }

    //this method is responsible for taking all fee, if takeFee is true
    function _tokenTransfer(
        address sender,
        address recipient,
        uint256 tAmount,
        bool takeFee
    ) private {

        valuesFromGetValues memory s = _getValues(tAmount, takeFee);

        if (_isExcluded[sender]) {
            //from excluded
            _tOwned[sender] = _tOwned[sender] - tAmount;
        }
        if (_isExcluded[recipient]) {
            //to excluded
            _tOwned[recipient] = _tOwned[recipient] + s.tTransferAmount;
        }

        _rOwned[sender] = _rOwned[sender] - s.rAmount;
        _rOwned[recipient] = _rOwned[recipient] + s.rTransferAmount;

        if (s.rRfi > 0 || s.tRfi > 0) _reflectRfi(s.rRfi, s.tRfi);
        if (s.rMarketing > 0 || s.tMarketing > 0) _takeMarketing(s.rMarketing, s.tMarketing);
        emit Transfer(sender, recipient, s.tTransferAmount);
    }

    function swapAndLiquify() private lockTheSwap {
       
        uint256 contractBalance = balanceOf(address(this));
        swapTokensForBNB(contractBalance);
        uint256 deltaBalance = address(this).balance;
       
        if (deltaBalance > 0) {
            payable(marketingWallet).sendValue(deltaBalance);
        }

    }

    function swapTokensForBNB(uint256 tokenAmount) private {
        // generate the pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();

        _approve(address(this), address(router), tokenAmount);

        // make the swap
        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

    //Use this in case BNB are sent to the contract by mistake
    function rescueBNB(uint256 weiAmount) external onlyOwner {
        require(address(this).balance >= weiAmount, "insufficient BNB balance");
        payable(msg.sender).transfer(weiAmount);
    }

    receive() external payable {}
}

Vulnerability type: CWE-664|CWE-404|CWE-772