diff --git a/chain33.fork.toml b/chain33.fork.toml
index 79c79eece..d4337f148 100644
--- a/chain33.fork.toml
+++ b/chain33.fork.toml
@@ -168,6 +168,7 @@ Enable=0
 
 [fork.sub.multisig]
 Enable=0
+ForkMultiSigFixStaleWeight=0
 
 [fork.sub.norm]
 Enable=0
diff --git a/chain33.para.toml b/chain33.para.toml
index 00afc4248..094c27f2e 100644
--- a/chain33.para.toml
+++ b/chain33.para.toml
@@ -500,6 +500,7 @@ Enable=0
 
 [fork.sub.multisig]
 Enable=0
+ForkMultiSigFixStaleWeight=0
 
 [fork.sub.mix]
 Enable=0
diff --git a/plugin/dapp/evm/cmd/ci2/chain33.proxyminer.toml b/plugin/dapp/evm/cmd/ci2/chain33.proxyminer.toml
index 1316dafbb..d5eb0f7d3 100644
--- a/plugin/dapp/evm/cmd/ci2/chain33.proxyminer.toml
+++ b/plugin/dapp/evm/cmd/ci2/chain33.proxyminer.toml
@@ -676,6 +676,7 @@ Enable=0
 
 [fork.sub.multisig]
 Enable=0
+ForkMultiSigFixStaleWeight=0
 
 [fork.sub.norm]
 Enable=0
diff --git a/plugin/dapp/multisig/executor/action.go b/plugin/dapp/multisig/executor/action.go
index 7fbac020c..30ef37b61 100644
--- a/plugin/dapp/multisig/executor/action.go
+++ b/plugin/dapp/multisig/executor/action.go
@@ -41,6 +41,11 @@ func newAction(t *MultiSig, tx *types.Transaction, index int32) *action {
 		t.GetBlockTime(), t.GetHeight(), index, dapp.ExecAddress(string(tx.Execer)), t.GetAPI()}
 }
 
+// isFixStaleWeight 判定当前高度是否启用确认权重按owner当前权重重算的修复分叉
+func (a *action) isFixStaleWeight() bool {
+	return a.api.GetConfig().IsDappFork(a.height, mty.MultiSigX, mty.ForkMultiSigFixStaleWeight)
+}
+
 // MultiSigAccCreate 创建多重签名账户
 func (a *action) MultiSigAccCreate(accountCreate *mty.MultiSigAccCreate) (*types.Receipt, error) {
 	var logs []*types.ReceiptLog
@@ -364,7 +369,7 @@ func (a *action) MultiSigConfirmTx(ConfirmTx *mty.MultiSigConfirmTx) (*types.Rec
 	}
 
 	multiSigTxOwner := &mty.MultiSigTxOwner{MultiSigAddr: multiSigAccAddr, Txid: ConfirmTx.TxId, ConfirmedOwner: owner}
-	isConfirm := isConfirmed(multiSigAcc.RequiredWeight, multiSigTx)
+	isConfirm := isConfirmed(multiSigAcc.RequiredWeight, multiSigTx, multiSigAcc, a.isFixStaleWeight())
 
 	//权重未达到要求或者撤销确认交易，构造MultiSigConfirmTx的receiptLog
 	if !isConfirm || !ConfirmTx.ConfirmOrRevoke {
@@ -757,7 +762,7 @@ func (a *action) executeTransferTx(multiSigAcc *mty.MultiSig, newMultiSigTx *mty
 
 	//确认此交易额度是否在每日限额之内，或者权重已达到要求
 	amount := transfer.Amount
-	confirmed := isConfirmed(multiSigAcc.RequiredWeight, newMultiSigTx)
+	confirmed := isConfirmed(multiSigAcc.RequiredWeight, newMultiSigTx, multiSigAcc, a.isFixStaleWeight())
 	underLimit, newlastday := isUnderLimit(a.blocktime, uint64(amount), curDailyLimit)
 
 	//新的一天更新lastday和spenttoday的值
@@ -838,7 +843,7 @@ func (a *action) executeTransferTx(multiSigAcc *mty.MultiSig, newMultiSigTx *mty
 func (a *action) executeAccOperateTx(multiSigAcc *mty.MultiSig, newMultiSigTx *mty.MultiSigTx, accountOperate *mty.MultiSigAccOperate, confOwner *mty.Owner, subOrConfirm bool) (*types.Receipt, error) {
 
 	//确认权重是否已达到要求
-	confirmed := isConfirmed(multiSigAcc.RequiredWeight, newMultiSigTx)
+	confirmed := isConfirmed(multiSigAcc.RequiredWeight, newMultiSigTx, multiSigAcc, a.isFixStaleWeight())
 	prevExecuted := newMultiSigTx.Executed
 
 	var logs []*types.ReceiptLog
@@ -899,7 +904,7 @@ func (a *action) executeOwnerOperateTx(multiSigAccount *mty.MultiSig, newMultiSi
 	var receiptLog *types.ReceiptLog
 	var err error
 	//确认权重是否已达到要求
-	confirmed := isConfirmed(multiSigAccount.RequiredWeight, newMultiSigTx)
+	confirmed := isConfirmed(multiSigAccount.RequiredWeight, newMultiSigTx, multiSigAccount, a.isFixStaleWeight())
 	prevExecuted := newMultiSigTx.Executed
 
 	flag := accountOperate.OperateFlag
diff --git a/plugin/dapp/multisig/executor/multisig.go b/plugin/dapp/multisig/executor/multisig.go
index 794626795..c041416a8 100644
--- a/plugin/dapp/multisig/executor/multisig.go
+++ b/plugin/dapp/multisig/executor/multisig.go
@@ -931,10 +931,20 @@ func getOwnerInfoByAddr(multiSigAcc *mty.MultiSig, oldowner string) (uint64, int
 }
 
 // 确认某笔交易是否已经达到确认需要的权重
-func isConfirmed(requiredWeight uint64, multiSigTx *mty.MultiSigTx) bool {
+// useCurWeight为true时忽略确认时记录的权重快照，按owner当前权重重新累计，
+// 防止owner权重被modify/del/replace后仍按过期权重凑足阈值执行交易
+func isConfirmed(requiredWeight uint64, multiSigTx *mty.MultiSigTx, multiSigAcc *mty.MultiSig, useCurWeight bool) bool {
 	var totalweight uint64
 	for _, owner := range multiSigTx.ConfirmedOwner {
-		totalweight += owner.Weight
+		weight := owner.Weight
+		if useCurWeight {
+			curWeight, isowner := isOwner(multiSigAcc, owner.OwnerAddr)
+			if !isowner {
+				continue
+			}
+			weight = curWeight
+		}
+		totalweight += weight
 	}
 	return totalweight >= requiredWeight
 }
diff --git a/plugin/dapp/multisig/executor/security_fix_test.go b/plugin/dapp/multisig/executor/security_fix_test.go
new file mode 100644
index 000000000..f2c253008
--- /dev/null
+++ b/plugin/dapp/multisig/executor/security_fix_test.go
@@ -0,0 +1,37 @@
+package executor
+
+import (
+	"testing"
+
+	mty "github.com/33cn/plugin/plugin/dapp/multisig/types"
+	"github.com/stretchr/testify/assert"
+)
+
+// TestIsConfirmedUsesCurrentWeight 确认修复分叉后按 owner 当前权重累计，不再使用确认时的过期快照
+func TestIsConfirmedUsesCurrentWeight(t *testing.T) {
+	acc := &mty.MultiSig{
+		RequiredWeight: 10,
+		Owners: []*mty.Owner{
+			{OwnerAddr: "ownerA", Weight: 5},
+			{OwnerAddr: "ownerB", Weight: 5},
+		},
+	}
+	tx := &mty.MultiSigTx{
+		ConfirmedOwner: []*mty.Owner{
+			{OwnerAddr: "ownerA", Weight: 5},
+			{OwnerAddr: "ownerB", Weight: 5},
+		},
+	}
+	assert.True(t, isConfirmed(10, tx, acc, false))
+	assert.True(t, isConfirmed(10, tx, acc, true))
+
+	// ownerB 被删除后：旧快照仍能凑足阈值，按当前 owner 权重则不能
+	acc.Owners = acc.Owners[:1]
+	assert.True(t, isConfirmed(10, tx, acc, false), "pre-fork keeps the stale snapshot behavior")
+	assert.False(t, isConfirmed(10, tx, acc, true), "post-fork must ignore removed owner")
+
+	// ownerA 被降权后，按当前权重重新累计也不能凑足阈值
+	acc2 := &mty.MultiSig{RequiredWeight: 10, Owners: []*mty.Owner{{OwnerAddr: "ownerA", Weight: 2}}}
+	assert.True(t, isConfirmed(10, tx, acc2, false))
+	assert.False(t, isConfirmed(10, tx, acc2, true))
+}
diff --git a/plugin/dapp/multisig/types/const.go b/plugin/dapp/multisig/types/const.go
index e3d8b12f0..7fe8e6251 100644
--- a/plugin/dapp/multisig/types/const.go
+++ b/plugin/dapp/multisig/types/const.go
@@ -37,6 +37,11 @@ var (
 	Multisiglog = log15.New("module", MultiSigX)
 )
 
+const (
+	// ForkMultiSigFixStaleWeight 修复确认权重判定使用过期权重快照的问题，按owner当前权重重新累计确认权重
+	ForkMultiSigFixStaleWeight = "ForkMultiSigFixStaleWeight"
+)
+
 // MultiSig 交易的actionid
 const (
 	ActionMultiSigAccCreate        = 10000
diff --git a/plugin/dapp/multisig/types/types.go b/plugin/dapp/multisig/types/types.go
index 82452fe6a..fc5ca3d5c 100644
--- a/plugin/dapp/multisig/types/types.go
+++ b/plugin/dapp/multisig/types/types.go
@@ -19,6 +19,7 @@ func init() {
 // InitFork ...
 func InitFork(cfg *types.Chain33Config) {
 	cfg.RegisterDappFork(MultiSigX, "Enable", 0)
+	cfg.RegisterDappFork(MultiSigX, ForkMultiSigFixStaleWeight, 0)
 }
 
 // InitExecutor ...