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4.3

Moodle lets attackers inject malicious scripts

CVE-2011-4290 · published 14 years ago
Summary

Moodle versions before 1.9.12 have flaws in a web library file that let a remote user place their own JavaScript or HTML into pages. This could be used to steal data or trick users into unwanted actions. Update Moodle to the latest 1.9.x release or apply the provided patches to close the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
moodle moodle 1.9.1
1.9.2
1.9.3
1.9.4
1.9.5
1.9.6
1.9.7
1.9.8
1.9.9
1.9.10
1.9.11
cpe:2.3:a:moodle:moodle:1.9.1:*:*:*:*:*:*:*
Original advisory text
Multiple cross-site scripting (XSS) vulnerabilities in lib/weblib.php in Moodle 1.9.x before 1.9.12 allow remote attackers to inject arbitrary web script or HTML via vectors related to URL encoding.
Multiple cross-site scripting (XSS) vulnerabilities in lib/weblib.php in Moodle 1.9.x before 1.9.12 allow remote attackers to inject arbitrary web script or HTML via vectors related to URL encoding.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
4.3 Medium
Exploitation
1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published16 Jul 2012
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2011-4290 · NVD
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