diff --git a/changelog/28042.txt b/changelog/28042.txt
new file mode 100644
index 000000000000..f49cad8ac597
--- /dev/null
+++ b/changelog/28042.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+activity: The sys/internal/counters/activity endpoint will return current month data when the end_date parameter is set to a future date.
+```
diff --git a/vault/activity_log.go b/vault/activity_log.go
index b063e853b014..a5cb76ffa92a 100644
--- a/vault/activity_log.go
+++ b/vault/activity_log.go
@@ -1769,12 +1769,20 @@ func (a *ActivityLog) handleQuery(ctx context.Context, startTime, endTime time.T
 	startTime = timeutil.StartOfMonth(startTime)
 	endTime = timeutil.EndOfMonth(endTime)
 
+	// At the max, we only want to return data up until the end of the current month.
+	// Adjust the end time be the current month if a future date has been provided.
+	endOfCurrentMonth := timeutil.EndOfMonth(a.clock.Now().UTC())
+	adjustedEndTime := endTime
+	if endTime.After(endOfCurrentMonth) {
+		adjustedEndTime = endOfCurrentMonth
+	}
+
 	// If the endTime of the query is the current month, request data from the queryStore
 	// with the endTime equal to the end of the last month, and add in the current month
 	// data.
-	precomputedQueryEndTime := endTime
-	if timeutil.IsCurrentMonth(endTime, a.clock.Now().UTC()) {
-		precomputedQueryEndTime = timeutil.EndOfMonth(timeutil.MonthsPreviousTo(1, timeutil.StartOfMonth(endTime)))
+	precomputedQueryEndTime := adjustedEndTime
+	if timeutil.IsCurrentMonth(adjustedEndTime, a.clock.Now().UTC()) {
+		precomputedQueryEndTime = timeutil.EndOfMonth(timeutil.MonthsPreviousTo(1, timeutil.StartOfMonth(adjustedEndTime)))
 		computePartial = true
 	}
 
@@ -1817,7 +1825,7 @@ func (a *ActivityLog) handleQuery(ctx context.Context, startTime, endTime time.T
 
 		// Estimate the current month totals. These record contains is complete with all the
 		// current month data, grouped by namespace and mounts
-		currentMonth, err := a.computeCurrentMonthForBillingPeriod(ctx, partialByMonth, startTime, endTime)
+		currentMonth, err := a.computeCurrentMonthForBillingPeriod(ctx, partialByMonth, startTime, adjustedEndTime)
 		if err != nil {
 			return nil, err
 		}
@@ -1867,7 +1875,7 @@ func (a *ActivityLog) handleQuery(ctx context.Context, startTime, endTime time.T
 	a.sortActivityLogMonthsResponse(months)
 
 	// Modify the final month output to make response more consumable based on API request
-	months = a.modifyResponseMonths(months, startTime, endTime)
+	months = a.modifyResponseMonths(months, startTime, adjustedEndTime)
 	responseData["months"] = months
 
 	return responseData, nil
diff --git a/vault/external_tests/activity_testonly/activity_testonly_test.go b/vault/external_tests/activity_testonly/activity_testonly_test.go
index 251be638a0f1..29a8675d3a6b 100644
--- a/vault/external_tests/activity_testonly/activity_testonly_test.go
+++ b/vault/external_tests/activity_testonly/activity_testonly_test.go
@@ -227,6 +227,45 @@ func Test_ActivityLog_EmptyDataMonths(t *testing.T) {
 	}
 }
 
+// Test_ActivityLog_FutureEndDate queries a start time from the past
+// and an end date in the future. The test
+// verifies that the current month is returned in the response.
+func Test_ActivityLog_FutureEndDate(t *testing.T) {
+	t.Parallel()
+	cluster := minimal.NewTestSoloCluster(t, nil)
+	client := cluster.Cores[0].Client
+	_, err := client.Logical().Write("sys/internal/counters/config", map[string]interface{}{
+		"enabled": "enable",
+	})
+	require.NoError(t, err)
+	_, err = clientcountutil.NewActivityLogData(client).
+		NewPreviousMonthData(1).
+		NewClientsSeen(10).
+		NewCurrentMonthData().
+		NewClientsSeen(10).
+		Write(context.Background(), generation.WriteOptions_WRITE_PRECOMPUTED_QUERIES, generation.WriteOptions_WRITE_ENTITIES)
+	require.NoError(t, err)
+
+	now := time.Now().UTC()
+	// query from the beginning of 3 months ago to beginning of next month
+	resp, err := client.Logical().ReadWithData("sys/internal/counters/activity", map[string][]string{
+		"end_time":   {timeutil.StartOfNextMonth(now).Format(time.RFC3339)},
+		"start_time": {timeutil.StartOfMonth(timeutil.MonthsPreviousTo(3, now)).Format(time.RFC3339)},
+	})
+	require.NoError(t, err)
+	monthsResponse := getMonthsData(t, resp)
+
+	require.Len(t, monthsResponse, 4)
+
+	// Get the last month of data in the slice
+	expectedCurrentMonthData := monthsResponse[3]
+	expectedTime, err := time.Parse(time.RFC3339, expectedCurrentMonthData.Timestamp)
+	require.NoError(t, err)
+	if !timeutil.IsCurrentMonth(expectedTime, now) {
+		t.Fatalf("final month data is not current month")
+	}
+}
+
 func getMonthsData(t *testing.T, resp *api.Secret) []vault.ResponseMonth {
 	t.Helper()
 	monthsRaw, ok := resp.Data["months"]