diff --git a/app/models/submission.rb b/app/models/submission.rb
index 5eae114b..56fd92cf 100644
--- a/app/models/submission.rb
+++ b/app/models/submission.rb
@@ -88,6 +88,14 @@ class Submission < ApplicationRecord
 
   scope :active, -> { where(archived_at: nil) }
   scope :archived, -> { where.not(archived_at: nil) }
+
+  # Submissions are visible when the user created them, or when they are a
+  # named submitter on the submission (by email). Applies to all roles.
+  scope :visible_to, lambda { |user|
+    submitter_ids = Submitter.where(email: user.email).select(:submission_id)
+    where(account_id: user.account_id)
+      .where('submissions.created_by_user_id = ? OR submissions.id IN (?)', user.id, submitter_ids)
+  }
   scope :pending, lambda {
     where(expire_at: nil).or(where(expire_at: Time.current..))
                          .where(Submitter.where(Submitter.arel_table[:submission_id].eq(Submission.arel_table[:id])
diff --git a/app/models/submitter.rb b/app/models/submitter.rb
index 0e4bc6c2..55802042 100644
--- a/app/models/submitter.rb
+++ b/app/models/submitter.rb
@@ -68,6 +68,11 @@ class Submitter < ApplicationRecord
 
   scope :completed, -> { where.not(completed_at: nil) }
 
+  # Submitters are visible when attached to a submission visible to the user.
+  scope :visible_to, lambda { |user|
+    where(submission_id: Submission.visible_to(user).select(:id))
+  }
+
   after_destroy :anonymize_email_events, if: -> { Docuseal.multitenant? }
 
   def status
diff --git a/lib/ability.rb b/lib/ability.rb
index c485c091..cfd013d3 100644
--- a/lib/ability.rb
+++ b/lib/ability.rb
@@ -29,22 +29,51 @@ class Ability
     can :destroy, Template, account_id: user.account_id
     can :manage, TemplateFolder, account_id: user.account_id
     can :manage, TemplateSharing, template: { account_id: user.account_id }
-    can :manage, Submission, account_id: user.account_id
-    can :manage, Submitter, account_id: user.account_id
+
+    # Submissions/Submitters are scoped to creator or assigned signer,
+    # regardless of role (admin included).
+    can :create, Submission, account_id: user.account_id
+    can %i[read update destroy], Submission, Submission.visible_to(user) do |submission|
+      submission.account_id == user.account_id &&
+        (submission.created_by_user_id == user.id ||
+         submission.submitters.exists?(email: user.email))
+    end
+    can %i[read update destroy], Submitter, Submitter.visible_to(user) do |submitter|
+      submitter.submission.account_id == user.account_id &&
+        (submitter.submission.created_by_user_id == user.id ||
+         submitter.submission.submitters.exists?(email: user.email))
+    end
+
     can :manage, User, account_id: user.account_id
     can :manage, EncryptedConfig, account_id: user.account_id
     can :manage, AccountConfig, account_id: user.account_id
     can :manage, Account, id: user.account_id
     can :manage, McpToken, user_id: user.id
     can :manage, WebhookUrl, account_id: user.account_id
-
-    can :manage, :mcp
+Submission.visible_to(user) do |submission|
+      submission.== &&
+        (submission.id == user. ||
+         submission.submitters.exists?(emailemal))
+    en
+    can :manage, :mcp Submitter.visible_to(user)do |tter|
+      ubmitter.ubmssi.== &&
+        (submitter.submission.id == user. ||
+         submitter.submission.submitters.exists?(emailemal))
+    en
   end
 
   def editor_abilities(user)
     can %i[read create update], Template, Abilities::TemplateConditions.collection(user) do |template|
-      Abilities::TemplateConditions.entity(template, user:, ability: 'manage')
-    end
+      Abilities::TemplateCoSubmission.visible_to(user) do |submission|
+      submission.nditions.et== ity(template, ue&&
+        (submission.r:, ability: 'maid == user.na ||
+         submission.submitters.exists?(emailge')emal))
+    en
+    end Submitter.visible_to(user)do |tter|
+      ubmitter.ubmssi.== &&
+        (submitter.submission.id == user. ||
+         submitter.submission.submitters.exists?(emailemal))
+    en
 
     can :manage, TemplateFolder, account_id: user.account_id
     can :manage, TemplateSharing, template: { account_id: user.account_id }
diff --git a/playwright/tests/v0.7.0-submission-visibility.spec.ts b/playwright/tests/v0.7.0-submission-visibility.spec.ts
new file mode 100644
index 00000000..5b2df866
--- /dev/null
+++ b/playwright/tests/v0.7.0-submission-visibility.spec.ts
@@ -0,0 +1,39 @@
+import { test, expect } from '@playwright/test';
+import { loginAs, adminEmail, adminPassword } from './helpers/auth';
+
+// Phase 1.3 — Submission visibility (signer-only).
+// A submission is only visible to:
+//  - the user who created it, OR
+//  - a user whose email matches a submitter on the submission.
+// Applies to all roles, including admin.
+//
+// Requires a second admin user pre-seeded:
+//   - admin2@example.com / password  (same account as the primary admin)
+
+const secondAdminEmail = process.env.DOCUSEAL_ADMIN2_EMAIL || 'admin2@example.com';
+const secondAdminPassword = process.env.DOCUSEAL_ADMIN2_PASSWORD || 'password';
+
+test.describe('Submission visibility', () => {
+  test("another admin in the same account cannot see user A's submissions", async ({
+    browser,
+  }) => {
+    const ctxA = await browser.newContext();
+    const pageA = await ctxA.newPage();
+    await loginAs(pageA, adminEmail, adminPassword);
+    await pageA.goto('/submissions');
+    // Capture the first submission's visible text (if any) as a probe.
+    const firstRow = pageA.locator('table tbody tr').first();
+    const hasSubmission = (await firstRow.count()) > 0;
+    const probeText = hasSubmission ? (await firstRow.innerText()).split('\n')[0] : null;
+    await ctxA.close();
+
+    const ctxB = await browser.newContext();
+    const pageB = await ctxB.newPage();
+    await loginAs(pageB, secondAdminEmail, secondAdminPassword);
+    await pageB.goto('/submissions');
+    if (probeText) {
+      await expect(pageB.getByText(probeText)).toHaveCount(0);
+    }
+    await ctxB.close();
+  });
+});