How severe is CVE-2009-0502?

CVE-2009-0502 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2009-0502 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0502?

CVE-2009-0502 primarily affects Snoopy. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0502?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-0502 published?

CVE-2009-0502 was published on 2009-02-10 and last updated on 2026-06-16.

CVE-2009-0502

CVE-2009-0502 is a medium-severity vulnerability in Snoopy with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Snoopy
Published: 2009-02-10
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2009-0502?: 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.
How severe is CVE-2009-0502?: CVE-2009-0502 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2009-0502 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0502?: CVE-2009-0502 primarily affects Snoopy. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0502?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-0502 published?: CVE-2009-0502 was published on 2009-02-10 and last updated on 2026-06-16.

References

Affected products (18)

cpe:2.3:a:snoopy:snoopy:1.2.3:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.7.0:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.7.1:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.7.2:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.7.3:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.7.4:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.7.5:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.7.6:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.8.1:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.8.2:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.8.3:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.8.4:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.8.5:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.8.6:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.8.7:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.1:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.2:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.3:*:*:*:*:*:*:*

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