diff --git a/webapp/migrations/Version20250907161952.php b/webapp/migrations/Version20250907161952.php
new file mode 100644
index 0000000000..725a7959ba
--- /dev/null
+++ b/webapp/migrations/Version20250907161952.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20250907161952 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add submission source to submission info.';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE submission ADD source VARCHAR(255) NOT NULL DEFAULT \'unknown\' COMMENT \'Where did we receive this submission from?\'');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE submission DROP source');
+    }
+
+    public function isTransactional(): bool
+    {
+        return false;
+    }
+}
diff --git a/webapp/src/Entity/Submission.php b/webapp/src/Entity/Submission.php
index 74f481c4d0..0167b67386 100644
--- a/webapp/src/Entity/Submission.php
+++ b/webapp/src/Entity/Submission.php
@@ -102,6 +102,12 @@ class Submission extends BaseApiEntity implements
     #[Serializer\Groups([ARC::GROUP_NONSTRICT])]
     private ?string $importError = null;
 
+    #[ORM\Column(options: [
+        'comment' => 'Where did we receive this submission from?',
+    ])]
+    #[Serializer\Exclude]
+    private SubmissionSource $source = SubmissionSource::UNKNOWN;
+
     #[ORM\ManyToOne(inversedBy: 'submissions')]
     #[ORM\JoinColumn(name: 'cid', referencedColumnName: 'cid', onDelete: 'CASCADE')]
     #[Serializer\Exclude]
@@ -553,4 +559,15 @@ public function getFileForApi(): array
     {
         return array_filter([$this->fileForApi]);
     }
+
+    public function setSource(SubmissionSource $source): Submission
+    {
+        $this->source = $source;
+        return $this;
+    }
+
+    public function getSource(): SubmissionSource
+    {
+        return $this->source;
+    }
 }
diff --git a/webapp/src/Service/SubmissionService.php b/webapp/src/Service/SubmissionService.php
index 7bca8c9460..df101ff85b 100644
--- a/webapp/src/Service/SubmissionService.php
+++ b/webapp/src/Service/SubmissionService.php
@@ -700,7 +700,8 @@ public function submitSolution(
             ->setOriginalSubmission($originalSubmission)
             ->setEntryPoint($entryPoint)
             ->setExternalid($externalId)
-            ->setImportError($importError);
+            ->setImportError($importError)
+            ->setSource($source);
 
         // Add expected results from source. We only do this for jury submissions
         // to prevent accidental auto-verification of team submissions.