[WEB-8074] fix: scope IssueListEndpoint to guest created_by

apps/api/plane/app/views/issue/base.py

@@ -93,6 +93,18 @@ def get(self, request, slug, project_id):
         # Base queryset with basic filters
         queryset = Issue.issue_objects.filter(workspace__slug=slug, project_id=project_id, pk__in=issue_ids)
 
+        # Restrict guests without full feature access to issues they created,
+        # mirroring IssueViewSet.list.
+        if ProjectMember.objects.filter(
+            workspace__slug=slug,
+            project_id=project_id,
+            member=request.user,
+            role=ROLE.GUEST.value,
+            is_active=True,
+            project__guest_view_all_features=False,
+        ).exists():
+            queryset = queryset.filter(created_by=request.user)
+
         # Apply filtering from filterset
         queryset = self.filter_queryset(queryset)
 

apps/api/plane/tests/contract/app/test_issue_list_guest_scope_app.py

@@ -0,0 +1,145 @@
+# Copyright (c) 2023-present Plane Software, Inc. and contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+# See the LICENSE file for details.
+
+"""Contract tests for ``IssueListEndpoint`` guest scoping.
+
+Regression coverage for GHSA-32c7-84jc-4w67 (WEB-8074). ``IssueListEndpoint.get``
+(``/workspaces/<slug>/projects/<project_id>/issues/list/``) returned any issue
+whose id was passed in ``?issues=``, without applying the guest ``created_by``
+restriction that its sibling ``IssueViewSet.list`` enforces. A project GUEST on a
+project with ``guest_view_all_features=False`` could therefore read issues they
+did not author by supplying their ids.
+
+The fix scopes the queryset to ``created_by=request.user`` for such guests,
+mirroring ``IssueViewSet.list``.
+"""
+
+from uuid import uuid4
+
+import pytest
+from rest_framework import status
+from rest_framework.test import APIClient
+
+from plane.db.models import (
+    Issue,
+    Project,
+    ProjectMember,
+    User,
+    WorkspaceMember,
+)
+
+LIST_URL = "/api/workspaces/{slug}/projects/{project_id}/issues/list/"
+
+
+@pytest.fixture
+def project(db, workspace, create_user):
+    """A project (guest_view_all_features defaults to False); owner is a member."""
+    project = Project.objects.create(
+        name="Scoped Project",
+        identifier="SP",
+        workspace=workspace,
+        created_by=create_user,
+    )
+    ProjectMember.objects.create(
+        project=project, member=create_user, workspace=workspace, role=20
+    )
+    return project
+
+
+@pytest.fixture
+def guest(db, workspace, project):
+    """An active project GUEST (role=5)."""
+    unique_id = uuid4().hex[:8]
+    user = User.objects.create(
+        email=f"guest-{unique_id}@plane.so",
+        username=f"guest_{unique_id}",
+        first_name="Guest",
+        last_name="User",
+    )
+    user.set_password("test-password")
+    user.save()
+    WorkspaceMember.objects.create(workspace=workspace, member=user, role=5)
+    ProjectMember.objects.create(
+        project=project, member=user, workspace=workspace, role=5
+    )
+    return user
+
+
+@pytest.fixture
+def guest_client(guest):
+    client = APIClient()
+    client.force_authenticate(user=guest)
+    return client
+
+
+def _make_issue(name, project, workspace, author):
+    """Create an issue with a deterministic ``created_by``.
+
+    ``BaseModel.save`` auto-sets ``created_by`` from the current request user
+    (None/anonymous under tests), so a ``created_by=`` kwarg to ``create`` is
+    overwritten. Passing ``created_by_id`` to ``save`` sets it explicitly.
+    """
+    issue = Issue(name=name, project=project, workspace=workspace)
+    issue.save(created_by_id=author.id)
+    return issue
+
+
+@pytest.fixture
+def own_issue(db, workspace, project, guest):
+    """An issue authored by the guest."""
+    return _make_issue("Guest's own issue", project, workspace, guest)
+
+
+@pytest.fixture
+def foreign_issue(db, workspace, project, create_user):
+    """An issue authored by someone other than the guest."""
+    return _make_issue("Someone else's issue", project, workspace, create_user)
+
+
+@pytest.mark.contract
+class TestIssueListGuestScope:
+    """A restricted guest must only get back issues they authored."""
+
+    @pytest.mark.django_db
+    def test_guest_cannot_read_foreign_issue(
+        self, guest_client, workspace, project, own_issue, foreign_issue
+    ):
+        url = LIST_URL.format(slug=workspace.slug, project_id=project.id)
+        response = guest_client.get(url, {"issues": f"{own_issue.id},{foreign_issue.id}"})
+
+        assert response.status_code == status.HTTP_200_OK, (
+            f"Got {response.status_code}: {getattr(response, 'data', None)!r}"
+        )
+        returned_ids = {str(row["id"]) for row in response.data}
+        assert str(own_issue.id) in returned_ids
+        assert str(foreign_issue.id) not in returned_ids, (
+            f"Guest read a foreign issue: {response.data!r}"
+        )
+
+    @pytest.mark.django_db
+    def test_project_member_reads_all_requested_issues(
+        self, session_client, workspace, project, own_issue, foreign_issue
+    ):
+        """Positive control: a full member (owner) still gets every requested issue."""
+        url = LIST_URL.format(slug=workspace.slug, project_id=project.id)
+        response = session_client.get(url, {"issues": f"{own_issue.id},{foreign_issue.id}"})
+
+        assert response.status_code == status.HTTP_200_OK
+        returned_ids = {str(row["id"]) for row in response.data}
+        assert {str(own_issue.id), str(foreign_issue.id)} <= returned_ids
+
+    @pytest.mark.django_db
+    def test_guest_with_view_all_reads_all_requested_issues(
+        self, guest_client, workspace, project, own_issue, foreign_issue
+    ):
+        """When guest_view_all_features is enabled, the guest sees all requested issues."""
+        project.guest_view_all_features = True
+        project.save(update_fields=["guest_view_all_features"])
+
+        url = LIST_URL.format(slug=workspace.slug, project_id=project.id)
+        response = guest_client.get(url, {"issues": f"{own_issue.id},{foreign_issue.id}"})
+
+        assert response.status_code == status.HTTP_200_OK
+        returned_ids = {str(row["id"]) for row in response.data}
+        assert {str(own_issue.id), str(foreign_issue.id)} <= returned_ids