diff --git a/app/__init__.py b/app/__init__.py
index 5b6eb77..cc225a0 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -1,6 +1,6 @@
 from datetime import datetime
 from flask import Flask, Blueprint, flash, render_template, request, url_for
-import ldap, ldap.filter, os
+import ldap, ldap.filter, os, re
 from app.exceptions import LoginNotFoundException, MultipleUsersFoundForLoginException
 from flask_migrate import Migrate
 from flask_mail import Mail, Message
@@ -11,6 +11,10 @@ load_dotenv()
 f_app = Flask(__name__)
 f_app.secret_key = os.getenv("SECRET_KEY")
 
+PASSWORD_PATTERN = re.compile(
+    r"""[A-Za-z0-9@#$%^&*\-_=+\[\]{}|\\:',.?/`~"();<> ]{5,255}"""
+)
+
 bp = Blueprint('mdp', __name__)
 
 f_app.config["SQLALCHEMY_DATABASE_URI"] = os.getenv("DATABASE_URI")
@@ -114,7 +118,9 @@ def password_reset_form(token: str = None):
 
     if not newpassword:
         error = "Le champ 'mot de passe' ne peut pas être vide."
-    
+    elif not PASSWORD_PATTERN.fullmatch(newpassword):
+        error = "Le mot de passe ne respecte pas les contraintes."
+
     if error is not None:
         flash(error)
         return render_template('pages/password_reset_form.html.j2')
@@ -193,4 +199,4 @@ def ldap_set_password(user_dn: str, newpassword: str):
     conn.modify_s(user_dn, [(ldap.MOD_REPLACE, 'unicodePwd', ['"{0}"'.format(newpassword).encode('utf-16-le')])])
 
 
-f_app.register_blueprint(bp)
\ No newline at end of file
+f_app.register_blueprint(bp)
diff --git a/app/templates/pages/password_reset_form.html.j2 b/app/templates/pages/password_reset_form.html.j2
index 9eaf8e1..0ecfd34 100644
--- a/app/templates/pages/password_reset_form.html.j2
+++ b/app/templates/pages/password_reset_form.html.j2
@@ -5,13 +5,23 @@
 {% block content %}
   <div>
   <p class="mb-5">Définissez votre nouveau mot de passe</p>
+  <p class="mb-5">
+    <span class="font-bold">Taille minimum&nbsp;:</span> 5 caractères<br>
+    <span class="font-bold">Taille maximum&nbsp;:</span> 255 caractères<br>
+    <span class="font-bold">Caractères autorisés&nbsp;:</span><br>
+    &nbsp; • A-Z<br>
+    &nbsp; • a-z<br>
+    &nbsp; • 0-9<br>
+    &nbsp; • @ # $ % ^ &amp; * - _ ! + = [ ] { } | \ : ' , . ? / ` ~ " ( ) ; &lt; &gt;<br>
+    &nbsp; • Espace
+  </p>
 
     <form method="POST">
       <div class="mb-5">
         <label class="block mb-2 text-sm font-medium text-gray-900" for="newpasswd">Nouveau mot de passe</label>
-        <input type="password" name="newpasswd" id="newpasswd" class="bg-gray-50 border border-gray-300 text-gray-900 text-sm rounded-lg focus:ring-blue-500 focus:border-blue-500 block w-full p-2.5" required>
+        <input type="password" name="newpasswd" id="newpasswd" class="bg-gray-50 border border-gray-300 text-gray-900 text-sm rounded-lg focus:ring-blue-500 focus:border-blue-500 block w-full p-2.5" pattern="^[A-Za-z0-9@#$%^&*\-_=+\[\]{}|\\:',.?/`~&quot;();<> ]{5,255}$" minlength="5" maxlength="255" required>
       </div>
       <button class="text-white bg-red-600 hover:bg-red-700 font-medium rounded-lg text-sm w-full sm:w-auto px-5 py-2.5 text-center" type="submit">Enregistrer</button>
     </form>
   </div>
-{% endblock %}
\ No newline at end of file
+{% endblock %}