diff --git a/rhodecode/model/forms.py b/rhodecode/model/forms.py
--- a/rhodecode/model/forms.py
+++ b/rhodecode/model/forms.py
@@ -424,7 +424,8 @@ def PullRequestForm(repo_id):
 def GistForm(lifetime_options):
     class _GistForm(formencode.Schema):
 
-        filename = v.UnicodeString(strip=True, required=False)
+        filename = All(v.BasePath()(),
+                       v.UnicodeString(strip=True, required=False))
         description = v.UnicodeString(required=False, if_missing='')
         lifetime = v.OneOf(lifetime_options)
         content = v.UnicodeString(required=True, not_empty=True)
diff --git a/rhodecode/model/gist.py b/rhodecode/model/gist.py
--- a/rhodecode/model/gist.py
+++ b/rhodecode/model/gist.py
@@ -120,6 +120,9 @@ class GistModel(BaseModel):
 
         processed_mapping = {}
         for filename in gist_mapping:
+            if filename != os.path.basename(filename):
+                raise Exception('Filename cannot be inside a directory')
+
             content = gist_mapping[filename]['content']
             #TODO: expand support for setting explicit lexers
 #             if lexer is None:
diff --git a/rhodecode/model/validators.py b/rhodecode/model/validators.py
--- a/rhodecode/model/validators.py
+++ b/rhodecode/model/validators.py
@@ -768,7 +768,8 @@ def ValidIp():
         messages = dict(
             badFormat=_('Please enter a valid IPv4 or IpV6 address'),
             illegalBits=_('The network size (bits) must be within the range'
-                ' of 0-32 (not %(bits)r)'))
+                ' of 0-32 (not %(bits)r)')
+        )
 
         def to_python(self, value, state):
             v = super(_validator, self).to_python(value, state)
@@ -800,10 +801,27 @@ def FieldKey():
     class _validator(formencode.validators.FancyValidator):
         messages = dict(
             badFormat=_('Key name can only consist of letters, '
-                        'underscore, dash or numbers'),)
+                        'underscore, dash or numbers')
+        )
 
         def validate_python(self, value, state):
             if not re.match('[a-zA-Z0-9_-]+$', value):
                 raise formencode.Invalid(self.message('badFormat', state),
                                          value, state)
     return _validator
+
+
+def BasePath():
+    class _validator(formencode.validators.FancyValidator):
+        messages = dict(
+            badPath=_('Filename cannot be inside a directory')
+        )
+
+        def _to_python(self, value, state):
+            return value
+
+        def validate_python(self, value, state):
+            if value != os.path.basename(value):
+                raise formencode.Invalid(self.message('badPath', state),
+                                         value, state)
+    return _validator
diff --git a/rhodecode/tests/functional/test_admin_gists.py b/rhodecode/tests/functional/test_admin_gists.py
--- a/rhodecode/tests/functional/test_admin_gists.py
+++ b/rhodecode/tests/functional/test_admin_gists.py
@@ -75,6 +75,16 @@ class TestGistsController(TestController
         response.mustcontain('gist test')
         response.mustcontain('<div class="ui-btn green badge">Public gist</div>')
 
+    def test_create_with_path_with_dirs(self):
+        self.log_user()
+        response = self.app.post(url('gists'),
+                                 params={'lifetime': -1,
+                                         'content': 'gist test',
+                                         'filename': '/home/foo',
+                                         'public': 'public'},
+                                 status=200)
+        response.mustcontain('Filename cannot be inside a directory')
+
     def test_access_expired_gist(self):
         self.log_user()
         gist = _create_gist('never-see-me')