diff --git a/app/__init__.py b/app/__init__.py
index 9614d55b..db66bc4d 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -17,25 +17,28 @@ from flask import current_app, g, request
 from flask import Flask
 from flask import abort, flash, has_request_context, jsonify
 from flask import render_template
+from flask.json import JSONEncoder
+from flask.logging import default_handler
+
 from flask_bootstrap import Bootstrap
 from flask_caching import Cache
-from flask_cas import CAS
 from flask_login import LoginManager, current_user
 from flask_mail import Mail
 from flask_migrate import Migrate
 from flask_moment import Moment
 from flask_sqlalchemy import SQLAlchemy
-from flask.json import JSONEncoder
-from flask.logging import default_handler
 
 from jinja2 import select_autoescape
 import sqlalchemy
 
+from flask_cas import CAS
+
 from app.scodoc.sco_exceptions import (
     AccessDenied,
     ScoBugCatcher,
     ScoException,
     ScoGenError,
+    ScoInvalidCSRF,
     ScoValueError,
     APIInvalidParams,
 )
@@ -71,6 +74,15 @@ def handle_access_denied(exc):
     return render_template("error_access_denied.j2", exc=exc), 403
 
 
+def handle_invalid_csrf(exc):
+    """Form submit with invalid CSRF token"""
+    # logout user and go back to login page with an error message
+    from app import auth
+
+    auth.logic.logout()
+    return render_template("error_csrf.j2", exc=exc), 404
+
+
 def internal_server_error(exc):
     """Bugs scodoc, erreurs 500"""
     # note that we set the 500 status explicitly
@@ -260,6 +272,7 @@ def create_app(config_class=DevConfig):
     app.register_error_handler(ScoGenError, handle_sco_value_error)
     app.register_error_handler(ScoValueError, handle_sco_value_error)
     app.register_error_handler(ScoBugCatcher, handle_sco_bug)
+    app.register_error_handler(ScoInvalidCSRF, handle_invalid_csrf)
     app.register_error_handler(AccessDenied, handle_access_denied)
     app.register_error_handler(500, internal_server_error)
     app.register_error_handler(503, postgresql_server_error)
diff --git a/app/auth/logic.py b/app/auth/logic.py
index a1737a3b..fc4ee02b 100644
--- a/app/auth/logic.py
+++ b/app/auth/logic.py
@@ -5,12 +5,13 @@
 import http
 
 import flask
-from flask import g, redirect, request, url_for
+from flask import current_app, g, redirect, request, url_for
 from flask_httpauth import HTTPBasicAuth, HTTPTokenAuth
 import flask_login
 
 from app import login
 from app.auth.models import User
+from app.models.config import ScoDocSiteConfig
 from app.scodoc.sco_utils import json_error
 
 basic_auth = HTTPBasicAuth()
@@ -84,3 +85,15 @@ def unauthorized():
     if request.blueprint == "api" or request.blueprint == "apiweb":
         return json_error(http.HTTPStatus.UNAUTHORIZED, "Non autorise (logic)")
     return redirect(url_for("auth.login"))
+
+
+def logout() -> flask.Response:
+    """Logout the current user: If CAS session, logout from CAS. Redirect."""
+    if flask_login.current_user:
+        user_name = getattr(flask_login.current_user, "user_name", "anonymous")
+        current_app.logger.info(f"logout user {user_name}")
+    flask_login.logout_user()
+    if ScoDocSiteConfig.is_cas_enabled() and flask.session.get("scodoc_cas_login_date"):
+        flask.session.pop("scodoc_cas_login_date", None)
+        return redirect(url_for("cas.logout"))
+    return redirect(url_for("scodoc.index"))
diff --git a/app/auth/routes.py b/app/auth/routes.py
index c3b4f717..8fedf302 100644
--- a/app/auth/routes.py
+++ b/app/auth/routes.py
@@ -6,12 +6,11 @@ auth.routes.py
 import flask
 from flask import current_app, flash, render_template
 from flask import redirect, url_for, request
-from flask_login import login_user, logout_user, current_user
+from flask_login import login_user, current_user
 from sqlalchemy import func
 
 from app import db
-from app.auth import bp
-from app.auth import cas
+from app.auth import bp, cas, logic
 from app.auth.forms import (
     CASUsersImportConfigForm,
     LoginForm,
@@ -87,14 +86,7 @@ def login_scodoc():
 @bp.route("/logout")
 def logout() -> flask.Response:
     "Logout a scodoc user. If CAS session, logout from CAS. Redirect."
-    if current_user:
-        user_name = getattr(current_user, "user_name", "anonymous")
-        current_app.logger.info(f"logout user {user_name}")
-    logout_user()
-    if ScoDocSiteConfig.is_cas_enabled() and flask.session.get("scodoc_cas_login_date"):
-        flask.session.pop("scodoc_cas_login_date", None)
-        return redirect(url_for("cas.logout"))
-    return redirect(url_for("scodoc.index"))
+    return logic.logout()
 
 
 @bp.route("/create_user", methods=["GET", "POST"])
@@ -140,7 +132,10 @@ def reset_password_request():
         )
         return redirect(url_for("auth.login"))
     return render_template(
-        "auth/reset_password_request.j2", title=_("Reset Password"), form=form
+        "auth/reset_password_request.j2",
+        title=_("Reset Password"),
+        form=form,
+        is_cas_enabled=ScoDocSiteConfig.is_cas_enabled(),
     )
 
 
diff --git a/app/scodoc/TrivialFormulator.py b/app/scodoc/TrivialFormulator.py
index 0e805f01..b673a3eb 100644
--- a/app/scodoc/TrivialFormulator.py
+++ b/app/scodoc/TrivialFormulator.py
@@ -10,6 +10,11 @@
 """
 import html
 import re
+
+import flask_wtf
+import wtforms
+from app import log
+from app.scodoc.sco_exceptions import ScoInvalidCSRF
 import app.scodoc.sco_utils as scu
 
 # re validant dd/mm/yyyy
@@ -22,7 +27,7 @@ def TrivialFormulator(
     form_url,
     values,
     formdescription=(),
-    initvalues={},
+    initvalues=None,
     method="post",
     enctype=None,
     submitlabel="OK",
@@ -32,7 +37,7 @@ def TrivialFormulator(
     cssclass="",
     cancelbutton=None,
     submitbutton=True,
-    submitbuttonattributes=[],
+    submitbuttonattributes=None,
     top_buttons=False,  # place buttons at top of form
     bottom_buttons=True,  # buttons after form
     html_foot_markup="",
@@ -99,7 +104,7 @@ def TrivialFormulator(
         form_url,
         values,
         formdescription,
-        initvalues,
+        initvalues or {},
         method,
         enctype,
         submitlabel,
@@ -109,7 +114,7 @@ def TrivialFormulator(
         cssclass=cssclass,
         cancelbutton=cancelbutton,
         submitbutton=submitbutton,
-        submitbuttonattributes=submitbuttonattributes,
+        submitbuttonattributes=submitbuttonattributes or [],
         top_buttons=top_buttons,
         bottom_buttons=bottom_buttons,
         html_foot_markup=html_foot_markup,
@@ -134,8 +139,8 @@ class TF(object):
         self,
         form_url,
         values,
-        formdescription=[],
-        initvalues={},
+        formdescription=None,
+        initvalues=None,
         method="POST",
         enctype=None,
         submitlabel="OK",
@@ -145,7 +150,7 @@ class TF(object):
         cssclass="",
         cancelbutton=None,
         submitbutton=True,
-        submitbuttonattributes=[],
+        submitbuttonattributes=None,
         top_buttons=False,  # place buttons at top of form
         bottom_buttons=True,  # buttons after form
         html_foot_markup="",  # html snippet put at the end, just after the table
@@ -157,8 +162,8 @@ class TF(object):
     ):
         self.form_url = form_url
         self.values = values.copy()
-        self.formdescription = list(formdescription)
-        self.initvalues = initvalues
+        self.formdescription = list(formdescription or [])
+        self.initvalues = initvalues or {}
         self.method = method
         self.enctype = enctype
         self.submitlabel = submitlabel
@@ -171,7 +176,7 @@ class TF(object):
         self.cssclass = cssclass
         self.cancelbutton = cancelbutton
         self.submitbutton = submitbutton
-        self.submitbuttonattributes = submitbuttonattributes
+        self.submitbuttonattributes = submitbuttonattributes or []
         self.top_buttons = top_buttons
         self.bottom_buttons = bottom_buttons
         self.html_foot_markup = html_foot_markup
@@ -189,11 +194,26 @@ class TF(object):
         "true if form has been submitted"
         if self.is_submitted:
             return True
-        return self.values.get("%s_submitted" % self.formid, False)
+        form_submitted = self.values.get(f"{self.formid}_submitted", False)
+        if form_submitted:
+            self.check_csrf()
+        return form_submitted
+
+    def check_csrf(self):
+        """check token for POST forms.
+        Raises ScoInvalidCSRF on failure.
+        """
+        if self.method == "post":
+            token = self.values.get("csrf_token")
+            try:
+                flask_wtf.csrf.validate_csrf(token)
+            except wtforms.validators.ValidationError as exc:
+                log(f"Form.check_csrf: invalid CSRF token\n{exc.args}")
+                raise ScoInvalidCSRF() from exc
 
     def canceled(self):
         "true if form has been canceled"
-        return self.values.get("%s_cancel" % self.formid, False)
+        return self.values.get(f"{self.formid}_cancel", False)
 
     def getform(self):
         "return HTML form"
@@ -447,7 +467,13 @@ class TF(object):
                 self.form_attrs,
             )
         )
-        R.append('<input type="hidden" name="%s_submitted" value="1">' % self.formid)
+        if self.method == "post":
+            R.append(
+                f"""<input type="hidden" name="csrf_token" value="{
+                    flask_wtf.csrf.generate_csrf()
+                }">"""
+            )
+        R.append(f"""<input type="hidden" name="{self.formid}_submitted" value="1">""")
         if self.top_buttons:
             R.append(buttons_markup + "<p></p>")
         R.append(self.before_table.format(title=self.title))
diff --git a/app/scodoc/sco_archives.py b/app/scodoc/sco_archives.py
index e63ef32b..c95add7d 100644
--- a/app/scodoc/sco_archives.py
+++ b/app/scodoc/sco_archives.py
@@ -500,7 +500,6 @@ enregistrés et non modifiables, on peut les retrouver ultérieurement.
         scu.get_request_args(),
         descr,
         cancelbutton="Annuler",
-        method="POST",
         submitlabel="Générer et archiver les documents",
         name="tf",
         formid="group_selector",
diff --git a/app/scodoc/sco_exceptions.py b/app/scodoc/sco_exceptions.py
index 77c9a077..a2186940 100644
--- a/app/scodoc/sco_exceptions.py
+++ b/app/scodoc/sco_exceptions.py
@@ -38,6 +38,10 @@ class InvalidNoteValue(ScoException):
     "Valeur note invalide. Usage interne saisie note."
 
 
+class ScoInvalidCSRF(ScoException):
+    "Erreur validation token CSRF"
+
+
 class ScoValueError(ScoException):
     "Exception avec page d'erreur utilisateur, et qui stoque dest_url"
     # mal nommée: super classe de toutes les exceptions avec page
diff --git a/app/scodoc/sco_formsemestre_custommenu.py b/app/scodoc/sco_formsemestre_custommenu.py
index ed39904b..ce9557eb 100644
--- a/app/scodoc/sco_formsemestre_custommenu.py
+++ b/app/scodoc/sco_formsemestre_custommenu.py
@@ -122,7 +122,6 @@ def formsemestre_custommenu_edit(formsemestre_id):
         descr,
         initvalues=initvalues,
         cancelbutton="Annuler",
-        method="GET",
         submitlabel="Enregistrer",
         name="tf",
     )
diff --git a/app/scodoc/sco_formsemestre_inscriptions.py b/app/scodoc/sco_formsemestre_inscriptions.py
index 1d0a25ef..79f7f006 100644
--- a/app/scodoc/sco_formsemestre_inscriptions.py
+++ b/app/scodoc/sco_formsemestre_inscriptions.py
@@ -633,7 +633,6 @@ function chkbx_select(field_id, state) {
         descr,
         initvalues,
         cancelbutton="Annuler",
-        method="post",
         submitlabel="Modifier les inscriptions",
         cssclass="inscription",
         name="tf",
diff --git a/app/scodoc/sco_groups.py b/app/scodoc/sco_groups.py
index 08d09bea..36d6946c 100644
--- a/app/scodoc/sco_groups.py
+++ b/app/scodoc/sco_groups.py
@@ -1441,7 +1441,6 @@ def groups_auto_repartition(partition_id=None):
         descr,
         {},
         cancelbutton="Annuler",
-        method="GET",
         submitlabel="Créer et peupler les groupes",
         name="tf",
     )
diff --git a/app/scodoc/sco_liste_notes.py b/app/scodoc/sco_liste_notes.py
index f0451941..ac3f94aa 100644
--- a/app/scodoc/sco_liste_notes.py
+++ b/app/scodoc/sco_liste_notes.py
@@ -186,7 +186,7 @@ def do_evaluation_listenotes(
         cancelbutton=None,
         submitbutton=None,
         bottom_buttons=False,
-        method="GET",
+        method="GET",  # consultation
         cssclass="noprint",
         name="tf",
         is_submitted=True,  # toujours "soumis" (démarre avec liste complète)
diff --git a/app/scodoc/sco_pv_forms.py b/app/scodoc/sco_pv_forms.py
index a60a88ca..13fe41c6 100644
--- a/app/scodoc/sco_pv_forms.py
+++ b/app/scodoc/sco_pv_forms.py
@@ -385,7 +385,6 @@ def formsemestre_pvjury_pdf(formsemestre_id, group_ids: list[int] = None, etudid
         scu.get_request_args(),
         descr,
         cancelbutton="Annuler",
-        method="get",
         submitlabel="Générer document",
         name="tf",
         formid="group_selector",
@@ -554,7 +553,6 @@ def formsemestre_lettres_individuelles(formsemestre_id, group_ids=[]):
         scu.get_request_args(),
         descr,
         cancelbutton="Annuler",
-        method="POST",
         submitlabel="Générer document",
         name="tf",
         formid="group_selector",
diff --git a/app/templates/auth/reset_password_request.j2 b/app/templates/auth/reset_password_request.j2
index 773007a3..291d89a3 100644
--- a/app/templates/auth/reset_password_request.j2
+++ b/app/templates/auth/reset_password_request.j2
@@ -9,4 +9,15 @@
         {{ wtf.quick_form(form) }}
     </div>
 </div>
+{% if is_cas_enabled %}
+<div style="margin-top: 12px; color: red;">
+    <p>Attention: ce mécanisme permet de changer le mot de passe ScoDoc 
+    mais ne changera pas votre mot de passe sur le système de l'établissement.
+    </p>
+    <p>
+    Si vous vous connectez via vos identifiants de l'université (CAS), passez 
+    par la procédure de celle-ci (ENT ou autre).
+    </p>
+</div>
+{% endif %}
 {% endblock %}
\ No newline at end of file
diff --git a/app/views/absences.py b/app/views/absences.py
index c743b851..44018d47 100644
--- a/app/views/absences.py
+++ b/app/views/absences.py
@@ -1248,7 +1248,7 @@ def XMLgetBilletsEtud(etudid=False, code_nip=False):
     return ""
 
 
-@bp.route("/list_billets", methods=["GET"])
+@bp.route("/list_billets", methods=["GET", "POST"])
 @scodoc
 @permission_required(Permission.ScoView)
 @scodoc7func
@@ -1271,7 +1271,6 @@ def list_billets():
         request.base_url,
         scu.get_request_args(),
         (("billet_id", {"input_type": "text", "title": "Numéro du billet :"}),),
-        method="get",
         submitbutton=False,
     )
     if tf[0] == 0:
diff --git a/app/views/notes.py b/app/views/notes.py
index 62071bcf..26207eab 100644
--- a/app/views/notes.py
+++ b/app/views/notes.py
@@ -2916,7 +2916,10 @@ sco_publish(
     methods=["GET", "POST"],
 )
 sco_publish(
-    "/formsemestre_pvjury_pdf", sco_pv_forms.formsemestre_pvjury_pdf, Permission.ScoView
+    "/formsemestre_pvjury_pdf",
+    sco_pv_forms.formsemestre_pvjury_pdf,
+    Permission.ScoView,
+    methods=["GET", "POST"],
 )
 sco_publish(
     "/feuille_preparation_jury",