MediaWiki
From Nick Jenkins
Various MediaWiki 1.6.1 parser tests, that fail HTML validation:
1: For the above table, "security aspect" is defined as anything that causes the start of a tag to be missing, or the end to be missing, or attributes of any type that should not be there to be injected. For example:
- <p><td><s></p> would not be considered to have a security aspect because all the tags are appearing ok (are not malformed), although it is invalid HTML.
- <a href="http://as<td></td><td class="external free"><p>user text here would be considered to have a security aspect because the "href" string is not properly terminated, and so the "external free" part is injected as attributes.
- A string missing the start of a tag would also be considered to have a security aspect - e.g. <th>|||||" class="external free" title="https://%7C%7C%7C%7C%7C%7C" rel="nofollow">https://</th> - because the <a href="xxx part has been cut off.
So to sum up: if tags are just in the wrong order, but are otherwise complete and well-formed, then it is not a security issue; otherwise it is considered to potentially be, and is listed as "Yes" in the above table.
