diff --git a/application/src/main/java/org/thingsboard/server/service/install/lts/LtsMigrationService.java b/application/src/main/java/org/thingsboard/server/service/install/lts/LtsMigrationService.java
index bec88fd2ad..a21d89cc53 100644
--- a/application/src/main/java/org/thingsboard/server/service/install/lts/LtsMigrationService.java
+++ b/application/src/main/java/org/thingsboard/server/service/install/lts/LtsMigrationService.java
@@ -110,7 +110,15 @@ public class LtsMigrationService {
         return migrations.stream()
                 .filter(migration -> {
                     LtsVersion version = LtsVersion.parse(migration.getVersion());
-                    return version.compareTo(from) > 0 && version.compareTo(to) <= 0;
+                    // Run only migrations whose family matches the target version. Older-family
+                    // migrations (e.g. 4.2.x) ride onto newer-family branches (e.g. 4.3.x) via the
+                    // release-merge cascade, but each branch's own family of migrations is
+                    // self-contained (newer-family copies reproduce the older schema/data changes),
+                    // so a cross-family upgrade is fully handled by the target-family migrations.
+                    // Excluding the dormant older-family beans avoids double-processing.
+                    return version.sameFamily(to)
+                            && version.compareTo(from) > 0
+                            && version.compareTo(to) <= 0;
                 })
                 .toList();
     }
diff --git a/application/src/test/java/org/thingsboard/server/service/install/lts/LtsMigrationServiceTest.java b/application/src/test/java/org/thingsboard/server/service/install/lts/LtsMigrationServiceTest.java
index 0674bdbea5..f2f3e93896 100644
--- a/application/src/test/java/org/thingsboard/server/service/install/lts/LtsMigrationServiceTest.java
+++ b/application/src/test/java/org/thingsboard/server/service/install/lts/LtsMigrationServiceTest.java
@@ -113,6 +113,21 @@ class LtsMigrationServiceTest {
         verify(schemaSettingsService).updateSchemaVersion("4.2.2.4");
     }
 
+    @Test
+    void skipsMigrationsOutsideTargetFamilyOnCrossFamilyUpgrade() {
+        List<String> applied = new ArrayList<>();
+        // 4.2.2.3 is carried onto a 4.3 branch by the release-merge cascade but must stay dormant:
+        // a cross-family 4.2 -> 4.3 upgrade is handled entirely by the 4.3-family migrations.
+        LtsMigrationService service = service(List.of(
+                migration("4.2.2.3", applied),
+                migration("4.3.1.2", applied),
+                migration("4.3.1.3", applied)));
+
+        service.runDataMigrations("4.2.2.2", "4.3.1.3");
+
+        assertEquals(List.of("4.3.1.2", "4.3.1.3"), applied);
+    }
+
     @Test
     void reRunAtCurrentVersionIsNoOp() throws Exception {
         List<String> applied = new ArrayList<>();