diff --git a/AUTHENTICATION.md b/AUTHENTICATION.md
index e2983cf..0100911 100644
--- a/AUTHENTICATION.md
+++ b/AUTHENTICATION.md
@@ -24,6 +24,7 @@ Die API verwendet **zwei verschiedene Authentifizierungs-Mechanismen** für unte
    ```env
    ADMIN_SESSION_SECRET=$(openssl rand -hex 32)
    ```
+   > ℹ️  Standardmäßig setzt der Server in Production HTTPS-Only Cookies (`Secure`). Falls deine Installation **ohne HTTPS** hinter einem internen Netzwerk läuft, kannst du das Verhalten über `ADMIN_SESSION_COOKIE_SECURE=false` explizit deaktivieren. Verwende dies nur in vertrauenswürdigen Umgebungen!
 2. **Backend starten** – Migration legt Tabelle `admin_users` an.
 3. **Setup-Status prüfen**:
    ```bash
@@ -189,7 +190,7 @@ npm test
 
 - [ ] `ADMIN_SESSION_SECRET` sicher generieren (>= 32 Bytes random)
 - [ ] `.env` nicht in Git committen (bereits in `.gitignore`)
-- [ ] HTTPS verwenden (TLS/SSL) damit Cookies `Secure` gesetzt werden können
+- [ ] HTTPS verwenden (TLS/SSL) damit Cookies `Secure` gesetzt werden können (falls nicht möglich: `ADMIN_SESSION_COOKIE_SECURE=false` setzen – nur in vertrauenswürdigen Netzen)
 - [ ] Session-Store auf persistentem Volume ablegen
 - [ ] Rate Limiting & Audit Logs überwachen
 - [ ] Admin-Benutzerverwaltung (On-/Offboarding) dokumentieren
diff --git a/README.dev.md b/README.dev.md
index 5ac4a55..7c7c15d 100644
--- a/README.dev.md
+++ b/README.dev.md
@@ -33,7 +33,7 @@ docker compose -f docker/dev/docker-compose.yml up -d
 ### Zugriff
 - **Frontend**: http://localhost:3000 (Hot Module Reloading aktiv)
 - **Backend**: http://localhost:5001 (API)
-- **API Documentation**: http://localhost:5001/api/docs/ (Swagger UI)
+- **API Documentation**: http://localhost:5001/api/docs/ (Swagger UI, nur in Development verfügbar)
 - **Slideshow**: http://localhost:3000/slideshow
 - **Moderation**: http://localhost:3000/moderation (Login über Admin Session)
 
@@ -430,6 +430,17 @@ git commit -m "feat: Add new feature"
 git push origin feature/my-feature
 ```
 
+### Git Hook (optional Absicherung)
+
+Für Deployments ohne HTTPS muss `docker/prod/docker-compose.yml` die Zeile `- ADMIN_SESSION_COOKIE_SECURE=false` enthalten. 
+Ein vorgefertigtes Pre-Commit-Hook stellt sicher, dass diese Zeile vorhanden ist bzw. automatisch korrigiert wird:
+
+```bash
+ln -s ../../scripts/git-hooks/pre-commit .git/hooks/pre-commit
+```
+
+Nach der Installation aktualisiert der Hook die Datei bei Bedarf und staged sie direkt. Entfernen kannst du ihn jederzeit über `rm .git/hooks/pre-commit`.
+
 ## Nützliche Befehle
 
 ```bash
diff --git a/README.md b/README.md
index e5ff297..d80c4e4 100644
--- a/README.md
+++ b/README.md
@@ -584,7 +584,7 @@ For detailed testing instructions, see: [`tests/TESTING-CLEANUP.md`](tests/TESTI
 
 | Variable | Default | Description | 
 |----------|---------|-------------|
-| `API_URL` | `http://localhost:5000` | Backend API endpoint | 
+| `API_URL` | `http://localhost:5001` | Backend API endpoint |
 | `CLIENT_URL` | `http://localhost` | Frontend application URL |
 
 ### Volume Configuration
diff --git a/backend/docs/openapi.json b/backend/docs/openapi.json
index c0cdce5..3bb9353 100644
--- a/backend/docs/openapi.json
+++ b/backend/docs/openapi.json
@@ -7,8 +7,8 @@
   },
   "servers": [
     {
-      "url": "http://localhost:5000",
-      "description": "Development server"
+      "url": "http://localhost:5001",
+      "description": "Development server (dev compose backend)"
     }
   ],
   "tags": [
diff --git a/backend/src/generate-openapi.js b/backend/src/generate-openapi.js
index 290dc21..4403362 100644
--- a/backend/src/generate-openapi.js
+++ b/backend/src/generate-openapi.js
@@ -19,7 +19,7 @@ const doc = {
     version: '1.0.0',
     description: 'Auto-generated OpenAPI spec with correct mount prefixes'
   },
-  host: 'localhost:5000',
+  host: 'localhost:5001',
   schemes: ['http'],
   // Add base path hints per router (swagger-autogen doesn't natively support per-file prefixes,
   // so we'll post-process or use @swagger annotations in route files)
@@ -71,7 +71,7 @@ async function generateWithPrefixes() {
     openapi: '3.0.0',
     info: doc.info,
     servers: [
-      { url: 'http://localhost:5000', description: 'Development server' }
+      { url: 'http://localhost:5001', description: 'Development server (dev compose backend)' }
     ],
     tags: Array.from(allTags).map(name => ({ name })),
     paths: allPaths
diff --git a/backend/src/middlewares/session.js b/backend/src/middlewares/session.js
index 8d1b652..5407c60 100644
--- a/backend/src/middlewares/session.js
+++ b/backend/src/middlewares/session.js
@@ -9,6 +9,35 @@ const SESSION_DIR = process.env.ADMIN_SESSION_DIR
     : path.join(__dirname, '..', 'data');
 const SESSION_SECRET = process.env.ADMIN_SESSION_SECRET;
 const IS_PRODUCTION = process.env.NODE_ENV === 'production';
+const ADMIN_SESSION_COOKIE_SECURE = process.env.ADMIN_SESSION_COOKIE_SECURE;
+
+const parseBooleanEnv = (value) => {
+    if (typeof value !== 'string') {
+        return undefined;
+    }
+
+    switch (value.toLowerCase().trim()) {
+        case 'true':
+        case '1':
+        case 'yes':
+        case 'on':
+            return true;
+        case 'false':
+        case '0':
+        case 'no':
+        case 'off':
+            return false;
+        default:
+            return undefined;
+    }
+};
+
+const secureOverride = parseBooleanEnv(ADMIN_SESSION_COOKIE_SECURE);
+const cookieSecure = secureOverride ?? IS_PRODUCTION;
+
+if (IS_PRODUCTION && secureOverride === false) {
+    console.warn('[Session] ADMIN_SESSION_COOKIE_SECURE=false detected – secure cookies disabled in production. Only do this on trusted HTTP deployments.');
+}
 
 if (!SESSION_SECRET) {
     throw new Error('ADMIN_SESSION_SECRET is required for session management');
@@ -33,7 +62,7 @@ const sessionMiddleware = session({
     saveUninitialized: false,
     cookie: {
         httpOnly: true,
-        secure: IS_PRODUCTION,
+        secure: cookieSecure,
         sameSite: 'strict',
         maxAge: 8 * 60 * 60 * 1000 // 8 hours
     }
diff --git a/backend/src/server.js b/backend/src/server.js
index 91ea314..19face3 100644
--- a/backend/src/server.js
+++ b/backend/src/server.js
@@ -4,7 +4,6 @@ const path = require('path');
 const initiateResources = require('./utils/initiate-resources');
 const dbManager = require('./database/DatabaseManager');
 const SchedulerService = require('./services/SchedulerService');
-const generateOpenApi = require('./generate-openapi');
 
 // Dev: Swagger UI (mount only in non-production) — require lazily
 let swaggerUi = null;
@@ -29,6 +28,7 @@ class Server {
         }
 
         try {
+            const generateOpenApi = require('./generate-openapi');
             console.log('🔄 Generating OpenAPI specification...');
             await generateOpenApi();
             console.log('✓ OpenAPI spec generated');
diff --git a/docker/prod/docker-compose.yml b/docker/prod/docker-compose.yml
index 147f911..7170a54 100644
--- a/docker/prod/docker-compose.yml
+++ b/docker/prod/docker-compose.yml
@@ -38,6 +38,8 @@ services:
       - NODE_ENV=production
       - ADMIN_SESSION_SECRET=MvFhivVIPIXvSGvWGfGOiQCkUJrmUsjWQTNGUgnSmtpsGHQlKruTBEBZgbVvOHHr
       - ADMIN_SESSION_DIR=/usr/src/app/src/data/sessions
+      - ADMIN_SESSION_COOKIE_SECURE=false
+
 
 networks:
   npm-nw:
diff --git a/docker/prod/frontend/nginx.conf b/docker/prod/frontend/nginx.conf
index f7022ae..42f6862 100644
--- a/docker/prod/frontend/nginx.conf
+++ b/docker/prod/frontend/nginx.conf
@@ -50,6 +50,15 @@ http {
             # Allow large uploads for batch upload endpoints
             client_max_body_size 100M;
         }
+
+        # Admin auth/session endpoints (login/logout/setup/csrf)
+        location /auth/ {
+            proxy_pass http://image-uploader-backend:5000;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+        }
         
         # API - Groups API routes (NO PASSWORD PROTECTION)
         location ~ ^/groups/[a-zA-Z0-9_-]+(/.*)?$ {
diff --git a/scripts/git-hooks/pre-commit b/scripts/git-hooks/pre-commit
new file mode 100755
index 0000000..8023dc7
--- /dev/null
+++ b/scripts/git-hooks/pre-commit
@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+TARGET_FILE="$ROOT_DIR/docker/prod/docker-compose.yml"
+ANCHOR_LINE="      - ADMIN_SESSION_DIR=/usr/src/app/src/data/sessions"
+EXPECTED_LINE="      - ADMIN_SESSION_COOKIE_SECURE=false"
+
+if [[ ! -f "$TARGET_FILE" ]]; then
+  exit 0
+fi
+
+export TARGET_FILE
+export ANCHOR_LINE
+export EXPECTED_LINE
+
+result=$(python3 <<'PY'
+import os
+import pathlib
+import re
+import sys
+
+path = pathlib.Path(os.environ['TARGET_FILE'])
+anchor = os.environ['ANCHOR_LINE']
+expected = os.environ['EXPECTED_LINE']
+text = path.read_text()
+changed = False
+
+if 'ADMIN_SESSION_COOKIE_SECURE' in text:
+    pattern = re.compile(r'(\-\s*ADMIN_SESSION_COOKIE_SECURE\s*=\s*)([^\n\r]+)')
+    new_text, count = pattern.subn(r'\1false', text, count=1)
+    if count:
+        changed = new_text != text
+else:
+    if anchor not in text:
+        print('ERROR: Anchor line not found for ADMIN_SESSION_COOKIE_SECURE insertion', file=sys.stderr)
+        sys.exit(2)
+    new_text = text.replace(anchor, anchor + '\n' + expected, 1)
+    changed = True
+
+if expected not in new_text:
+    print('ERROR: Failed to ensure ADMIN_SESSION_COOKIE_SECURE=false in docker-compose.yml', file=sys.stderr)
+    sys.exit(3)
+
+if changed:
+    path.write_text(new_text)
+    print('UPDATED')
+else:
+    print('UNCHANGED')
+PY
+)
+status=$?
+
+if [[ $status -ne 0 ]]; then
+  echo "$result"
+  echo "[pre-commit] Failed to normalize ADMIN_SESSION_COOKIE_SECURE" >&2
+  exit $status
+fi
+
+if [[ $result == "UPDATED" ]]; then
+  echo "[pre-commit] Normalized ADMIN_SESSION_COOKIE_SECURE in docker/prod/docker-compose.yml"
+  git -C "$ROOT_DIR" add "$TARGET_FILE"
+fi
+
+exit 0