Joomla! Documentation™

.htaccess and web.config Security Update

Since Joomla 3.9.3, Joomla is shipped with additional security hardenings in the default htaccess.txt and web.config.txt files. These hardenings disable the so called MIME-type sniffing feature in web browsers. The sniffing leads to specific attack vectors, where scripts in normally harmless file formats (i.e. images) will be executed, leading to Cross-Site-Scripting vulnerabilities. The Joomla Security Strike Team recommends to manually apply the necessary changes to existing .htaccess or web.config files, as those files can not be updated automatically.

Changes for .htaccess

Add the following lines before ## Mod_rewrite in use:

<IfModule mod_headers.c>
Header always set X-Content-Type-Options "nosniff"
</IfModule>

Changes for web.config

Add the following lines right after </rewrite>:

<httpProtocol>
  <customHeaders>
    <add name="X-Content-Type-Options" value="nosniff" />
  </customHeaders>
</httpProtocol>