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CVE-2009-0502: Moodle HTML blocks let attackers run malicious code

CVE-2009-0502 · published 17 years ago

Summary

In older Moodle versions (1.6 through 1.9) that use the Snoopy library, the HTML block does not properly clean content that is added. This lets an attacker insert harmful script or HTML, which runs when an administrator uses the "Login as" feature to view a page, potentially exposing data or altering the site. Upgrade Moodle to the patched versions (1.6.9, 1.7.7, 1.8.8, 1.9.4 or later) or apply the vendor's security update.

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

Vendor	Product	Affected versions
snoopy	snoopy	1.2.3 `cpe:2.3:a:snoopy:snoopy:1.2.3:::::::*`
moodle	moodle	1.7.0 1.7.1 1.7.2 1.7.3 1.7.4 1.7.5 1.7.6 1.8.1 1.8.2 1.8.3 1.8.4 1.8.5 5 more version ranges `cpe:2.3:a:moodle:moodle:1.7.0:::::::*`

Original advisory text

Cross-site scripting (XSS) vulnerability in blocks/html/block_html.php in Snoopy 1.2.3, as used in Moodle 1.6 before 1.6.9, 1.7 before 1.7.7, 1.8 before 1.8.8, and 1.9 before 1.9.4, allows remote attackers to inject arbitrary web script or HTML via an HTML block, which is not properly handled when the "Login as" feature is used to visit a MyMoodle or Blog page.

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

Published10 Feb 2009

Updated4 Nov 2026

First seen29 Sep 2026

Sources

CVE-2009-0502 · NVD

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