diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/routes/utils.test.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/routes/utils.test.ts
index 6ddeeaa5ea1c2..66ad07b9d1029 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/routes/utils.test.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/routes/utils.test.ts
@@ -136,7 +136,6 @@ describe.each([
 
   describe('mergeStatuses', () => {
     it('merges statuses and converts from camelCase saved object to snake_case HTTP response', () => {
-      //
       const statusOne = exampleRuleStatus();
       statusOne.attributes.status = RuleExecutionStatus.failed;
       const statusTwo = exampleRuleStatus();
diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_execution_log/saved_objects_adapter/rule_status_saved_objects_client.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_execution_log/saved_objects_adapter/rule_status_saved_objects_client.ts
index 0026bba24eebe..cd26ab82b494a 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_execution_log/saved_objects_adapter/rule_status_saved_objects_client.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_execution_log/saved_objects_adapter/rule_status_saved_objects_client.ts
@@ -67,6 +67,9 @@ export const ruleStatusSavedObjectsClientFactory = (
       type: 'alert',
     }));
     const order: 'desc' = 'desc';
+    // NOTE: Once https://github.com/elastic/kibana/issues/115153 is resolved
+    // ${legacyRuleStatusSavedObjectType}.statusDate will need to be updated to
+    // ${legacyRuleStatusSavedObjectType}.attributes.statusDate
     const aggs = {
       references: {
         nested: {
diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/rules/legacy_rule_status/legacy_migrations.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/rules/legacy_rule_status/legacy_migrations.ts
index 72ab4a2237ba1..877d693e5553c 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/rules/legacy_rule_status/legacy_migrations.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/rules/legacy_rule_status/legacy_migrations.ts
@@ -50,9 +50,13 @@ export const legacyMigrateRuleAlertIdSOReferences = (
   const { alertId, ...otherAttributes } = doc.attributes;
   const existingReferences = doc.references ?? [];
 
-  // early return if alertId is not a string as expected
+  // early return if alertId is not a string as expected, still removing alertId as the mapping no longer exists
   if (!isString(alertId)) {
-    return { ...doc, references: existingReferences };
+    return {
+      ...doc,
+      attributes: otherAttributes,
+      references: existingReferences,
+    };
   }
 
   const alertReferences = legacyMigrateAlertId({
diff --git a/x-pack/test/detection_engine_api_integration/security_and_spaces/tests/migrations.ts b/x-pack/test/detection_engine_api_integration/security_and_spaces/tests/migrations.ts
index d4eaf0d3dbf80..66d33de2ba4da 100644
--- a/x-pack/test/detection_engine_api_integration/security_and_spaces/tests/migrations.ts
+++ b/x-pack/test/detection_engine_api_integration/security_and_spaces/tests/migrations.ts
@@ -154,6 +154,37 @@ export default ({ getService }: FtrProviderContext): void => {
           lastLookBackDate: null,
         });
       });
+
+      // If alertId is not a string/null ensure it is removed as the mapping was removed and so the migration would fail.
+      // Specific test for this as e2e tests will not catch the mismatch and we can't use the migration test harness
+      // since this SO is not importable/exportable via the SOM.
+      // For details see: https://github.com/elastic/kibana/issues/116423
+      it('migrates legacy siem-detection-engine-rule-status and removes alertId when not a string', async () => {
+        const response = await es.get<{
+          'siem-detection-engine-rule-status': IRuleStatusSOAttributes;
+        }>(
+          {
+            index: '.kibana',
+            id: 'siem-detection-engine-rule-status:d62d2980-27c4-11ec-92b0-f7b47106bb36',
+          },
+          { meta: true }
+        );
+        expect(response.statusCode).to.eql(200);
+
+        expect(response.body._source?.['siem-detection-engine-rule-status']).to.eql({
+          statusDate: '2021-10-11T20:51:26.622Z',
+          status: 'succeeded',
+          lastFailureAt: '2021-10-11T18:10:08.982Z',
+          lastSuccessAt: '2021-10-11T20:51:26.622Z',
+          lastFailureMessage:
+            '4 days (323690920ms) were not queried between this rule execution and the last execution, so signals may have been missed. Consider increasing your look behind time or adding more Kibana instances. name: "Threshy" id: "fb1046a0-0452-11ec-9b15-d13d79d162f3" rule id: "b789c80f-f6d8-41f1-8b4f-b4a23342cde2" signals index: ".siem-signals-spong-default"',
+          lastSuccessMessage: 'succeeded',
+          gap: '4 days',
+          bulkCreateTimeDurations: ['34.49'],
+          searchAfterTimeDurations: ['62.58'],
+          lastLookBackDate: null,
+        });
+      });
     });
   });
 };
diff --git a/x-pack/test/functional/es_archives/security_solution/migrations/data.json b/x-pack/test/functional/es_archives/security_solution/migrations/data.json
index 97a2596f9dba1..89eb207b392e8 100644
--- a/x-pack/test/functional/es_archives/security_solution/migrations/data.json
+++ b/x-pack/test/functional/es_archives/security_solution/migrations/data.json
@@ -61,3 +61,34 @@
   }
 }
 
+{
+  "type": "doc",
+  "value": {
+    "id": "siem-detection-engine-rule-status:d62d2980-27c4-11ec-92b0-f7b47106bb36",
+    "index": ".kibana_1",
+    "source": {
+      "siem-detection-engine-rule-status": {
+        "alertId": 1337,
+        "statusDate": "2021-10-11T20:51:26.622Z",
+        "status": "succeeded",
+        "lastFailureAt": "2021-10-11T18:10:08.982Z",
+        "lastSuccessAt": "2021-10-11T20:51:26.622Z",
+        "lastFailureMessage": "4 days (323690920ms) were not queried between this rule execution and the last execution, so signals may have been missed. Consider increasing your look behind time or adding more Kibana instances. name: \"Threshy\" id: \"fb1046a0-0452-11ec-9b15-d13d79d162f3\" rule id: \"b789c80f-f6d8-41f1-8b4f-b4a23342cde2\" signals index: \".siem-signals-spong-default\"",
+        "lastSuccessMessage": "succeeded",
+        "gap": "4 days",
+        "bulkCreateTimeDurations": [
+          "34.49"
+        ],
+        "searchAfterTimeDurations": [
+          "62.58"
+        ],
+        "lastLookBackDate": null
+      },
+      "type": "siem-detection-engine-rule-status",
+      "references": [],
+      "coreMigrationVersion": "7.14.0",
+      "updated_at": "2021-10-11T20:51:26.657Z"
+    }
+  }
+}
+