diff --git a/api/v2.0/swagger.yaml b/api/v2.0/swagger.yaml
index b0a212156..129c5599c 100644
--- a/api/v2.0/swagger.yaml
+++ b/api/v2.0/swagger.yaml
@@ -8553,6 +8553,7 @@ definitions:
         description: Whether or not to skip cert verify.
       payload_format:
         $ref: '#/definitions/PayloadFormatType'
+        description: The payload format of webhook, by default is Default for http type.
   WebhookPolicy:
     type: object
     description: The webhook policy object
diff --git a/make/migrations/postgresql/0110_2.8.0_schema.up.sql b/make/migrations/postgresql/0110_2.8.0_schema.up.sql
index 5dfd7cd59..55420b88e 100644
--- a/make/migrations/postgresql/0110_2.8.0_schema.up.sql
+++ b/make/migrations/postgresql/0110_2.8.0_schema.up.sql
@@ -91,6 +91,42 @@ SET enabled = false,
     description = 'Chartmuseum is deprecated in Harbor v2.8.0, because this notification policy only has event type about Chartmuseum, so please update or delete this notification policy.'
 WHERE event_types = '[]';
 
+/* insert the default payload_format for http type webhook target */
+WITH targets_expanded AS (
+    -- Expand the JSON array of targets into separate rows
+    SELECT
+        id,
+        jsonb_array_elements(targets::jsonb) AS target
+    FROM
+        notification_policy
+),
+targets_updated AS (
+    -- Update targets based on the specified conditions
+    SELECT
+        id,
+        jsonb_agg(
+            CASE
+                -- If target is HTTP and has no payload format, add "Default"
+                WHEN target->>'type' = 'http' AND NOT target ? 'payload_format'
+                THEN target || '{"payload_format":"Default"}'::jsonb
+                ELSE target
+            END
+        ) AS targets
+    FROM
+        targets_expanded
+    GROUP BY
+        id
+)
+-- Update the original table with the updated targets
+UPDATE
+    notification_policy
+SET
+    targets = targets_updated.targets
+FROM
+    targets_updated
+WHERE
+    notification_policy.id = targets_updated.id;
+
 /* migrate the webhook job to execution and task as the webhook refactor since v2.8 */
 DO $$
 DECLARE
@@ -102,14 +138,18 @@ DECLARE
     exec_id integer;
     extra_attrs json;
  BEGIN
-    if exists (select 1 from information_schema.tables where table_name = 'notification_job') then
+    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'notification_job') THEN
         FOR job_group IN SELECT DISTINCT policy_id,event_type FROM notification_job WHERE event_type NOT IN ('UPLOAD_CHART', 'DOWNLOAD_CHART', 'DELETE_CHART')
         LOOP
-            SELECT * INTO job FROM notification_job WHERE
-                policy_id=job_group.policy_id
-                                  AND event_type=job_group.event_type
-                                  AND status IN ('stopped', 'finished', 'error')
+            SELECT * INTO job FROM notification_job
+            WHERE policy_id=job_group.policy_id
+            AND event_type=job_group.event_type
+            AND status IN ('stopped', 'finished', 'error')
             ORDER BY creation_time DESC LIMIT 1;
+            /* continue if no final status job found for this policy */
+            IF job IS NULL THEN
+                CONTINUE;
+            END IF;
             /* convert vendor type */
             IF job.notify_type = 'http' THEN
                 vendor_type = 'WEBHOOK';
diff --git a/src/server/v2.0/handler/webhook.go b/src/server/v2.0/handler/webhook.go
index 56f8988e6..22a14ffca 100644
--- a/src/server/v2.0/handler/webhook.go
+++ b/src/server/v2.0/handler/webhook.go
@@ -406,7 +406,7 @@ func (n *webhookAPI) validateTargets(policy *policy_model.Policy) (bool, error)
 	if len(policy.Targets) == 0 {
 		return false, errors.New(nil).WithMessage("empty notification target with policy %s", policy.Name).WithCode(errors.BadRequestCode)
 	}
-	for _, target := range policy.Targets {
+	for i, target := range policy.Targets {
 		url, err := utils.ParseEndpoint(target.Address)
 		if err != nil {
 			return false, errors.New(err).WithCode(errors.BadRequestCode)
@@ -426,6 +426,10 @@ func (n *webhookAPI) validateTargets(policy *policy_model.Policy) (bool, error)
 		if len(target.PayloadFormat) > 0 && !isPayloadFormatSupported(target.PayloadFormat) {
 			return false, errors.New(nil).WithMessage("unsupported payload format type: %s", target.PayloadFormat).WithCode(errors.BadRequestCode)
 		}
+		// set payload format to Default is not specified when the type is http
+		if len(target.PayloadFormat) == 0 && target.Type == "http" {
+			policy.Targets[i].PayloadFormat = "Default"
+		}
 	}
 	return true, nil
 }