[ci skip] Update changelog, version & upgrade instructions
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index f9f451d..d67ae4e 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -5,7 +5,13 @@
 Version 3.0.3
 =============
 
-Release Date: Not Released
+Release Date: October 31, 2015
+
+-  **Security**
+
+   -  Fixed an XSS attack vector in :doc:`Security Library <libraries/security>` method ``xss_clean()``.
+   -  Changed :doc:`Config Library <libraries/config>` method ``base_url()`` to fallback to ``$_SERVER['SERVER_ADDR']`` when ``$config['base_url']`` is empty in order to avoid *Host* header injections.
+   -  Changed :doc:`CAPTCHA Helper <helpers/captcha_helper>` to use the operating system's PRNG when possible.
 
 -  Database