Consolidating code ql findings (#2920)

* Consolidating code ql findings

* Added ref files for backstop to set baseline for removing custom js file

* Potential fix for code scanning alert no. 32: URL redirection from remote source

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

* Removed unused large file

* Fixed import order

---------

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

app/main/views/organizations.py

@@ -90,7 +90,12 @@ def organization_dashboard(org_id):
 @main.route("/organizations/<uuid:org_id>/download-usage-report.csv", methods=["GET"])
 @user_has_permissions()
 def download_organization_usage_report(org_id):
-    selected_year = request.args.get("selected_year")
+    selected_year_input = request.args.get("selected_year")
+    # Validate selected_year to prevent header injection
+    if selected_year_input and selected_year_input.isdigit() and len(selected_year_input) == 4:
+        selected_year = selected_year_input
+    else:
+        selected_year = str(datetime.now().year)
     services_usage = current_organization.services_and_usage(
         financial_year=selected_year
     )["services"]
@@ -121,6 +126,11 @@ def download_organization_usage_report(org_id):
         for service in services_usage
     ]
 
+    # Sanitize organization name for filename to prevent header injection
+    import re
+    safe_org_name = re.sub(r'[^\w\s-]', '', current_organization.name).strip()
+    safe_org_name = re.sub(r'[-\s]+', '-', safe_org_name)
+
     return (
         Spreadsheet.from_rows(org_usage_data).as_csv_data,
         200,
@@ -130,7 +140,7 @@ def download_organization_usage_report(org_id):
                 "inline;"
                 'filename="{} organization usage report for year {}'
                 ' - generated on {}.csv"'.format(
-                    current_organization.name,
+                    safe_org_name,
                     selected_year,
                     datetime.now().strftime("%Y-%m-%dT%H:%M:%S.%fZ"),
                 )

app/main/views/templates.py

@@ -1,4 +1,5 @@
 from functools import partial
+from urllib.parse import urlparse
 
 from flask import abort, flash, jsonify, redirect, render_template, request, url_for
 from flask_login import current_user
@@ -194,7 +195,19 @@ def process_folder_management_form(form, current_folder_id):
             ids_to_move=form.templates_and_folders.data, move_to=move_to_id
         )
 
-    return redirect(request.url)
+    # Use request.full_path which includes query string but not host
+    # This avoids host header injection while preserving all parameters
+    # Hardened redirect: only allow relative URLs, and strip any backslashes
+    target = request.full_path.replace('\\', '')
+    parts = urlparse(target)
+    if not parts.scheme and not parts.netloc and target.startswith('/'):
+        return redirect(target)
+    # Fallback to main template list for this service
+    return redirect(url_for(
+        '.choose_template',
+        service_id=current_service.id,
+        template_type='all'
+    ))
 
 
 def get_template_nav_label(value):