-diff -Naur pysaml2/src/saml2/authn.py pysaml2.new/src/saml2/authn.py
---- 1/src/saml2/authn.py 2018-01-11 17:23:27.198775074 -0600
-+++ 2/src/saml2/authn.py 2018-01-11 17:22:57.909567278 -0600
-@@ -147,7 +147,8 @@
+From 6312a41e037954850867f29d329e5007df1424a5 Mon Sep 17 00:00:00 2001
+From: Ioannis Kakavas <ikakavas@noc.grnet.gr>
+Date: Tue, 12 Sep 2017 12:22:47 +0300
+Subject: [PATCH] Quick fix for the authentication bypass due to optimizations
+ #451
+
+---
+ src/saml2/authn.py | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/src/saml2/authn.py b/src/saml2/authn.py
+index 1f2d02cf..1e1a220b 100644
+--- a/src/saml2/authn.py
++++ b/src/saml2/authn.py
+@@ -146,7 +146,8 @@ def __call__(self, cookie=None, policy_url=None, logo_url=None,
return resp
def _verify(self, pwd, user):
def verify(self, request, **kwargs):
"""
-
+@@ -176,7 +177,7 @@ def verify(self, request, **kwargs):
+ return_to = create_return_url(self.return_to, _dict["query"][0],
+ **{self.query_param: "true"})
+ resp = Redirect(return_to, headers=[cookie])
+- except (AssertionError, KeyError):
++ except (ValueError, KeyError):
+ resp = Unauthorized("Unknown user or wrong password")
+
+ return resp