Cross site scripting (XSS) in Moodle 1.8.3



Moodle is a course management system for educators.
The installer code is vulnerable to Cross Site Scripting, letting you inject JavaScript and steal cookies. The XSS can only be triggered if there's a not installed moodle, so this can be considered low impact. Still it's possible to attack if an attacker knows from another person installing moodle.

Sample code

Sample XSS code:

<form method="post" action="http://localhost/moodle/install.php">
<input type="hidden" name="stage" value="3">
<input type="text" name="dbname" value='"><script>alert(1)</script>'>
<input type=submit>

Update to 1.8.4.

Disclosure Timeline

2007-01-08 Vendor contacted
2007-01-08 Vendor fixed cvs
2007-01-11 Vendor released 1.8.4

CVE Information

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-0123 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.

Credits and copyright

This vulnerability was discovered by Hanno Boeck of webhosting. It's licensed under the creative commons attribution license.

Hanno Boeck, 2008-01-12,