How severe is CVE-2011-4593?

CVE-2011-4593 has a CVSS 2.0 base score of 4.0, rated medium severity.

Is CVE-2011-4593 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4593?

CVE-2011-4593 primarily affects Moodle. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4593?

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

When was CVE-2011-4593 published?

CVE-2011-4593 was published on 2012-07-20 and last updated on 2026-06-16.

CVE-2011-4593

CVE-2011-4593 is a medium-severity vulnerability in Moodle with a CVSS 2.0 base score of 4.0. 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-200.

Key facts

Severity: Medium (CVSS 2.0 base score 4.0)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Moodle
Published: 2012-07-20
Last modified: 2026-06-16

Description

Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, and 2.1.x before 2.1.3 does not properly handle user/action_redir group messages, which allows remote authenticated users to discover e-mail addresses by visiting the messaging interface.

Frequently asked questions

What is CVE-2011-4593?: Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, and 2.1.x before 2.1.3 does not properly handle user/action_redir group messages, which allows remote authenticated users to discover e-mail addresses by visiting the messaging interface.
How severe is CVE-2011-4593?: CVE-2011-4593 has a CVSS 2.0 base score of 4.0, rated medium severity.
Is CVE-2011-4593 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4593?: CVE-2011-4593 primarily affects Moodle. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4593?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4593 published?: CVE-2011-4593 was published on 2012-07-20 and last updated on 2026-06-16.

References

Affected products (23)

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:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.4:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.5:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.6:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.7:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.8:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.9:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.10:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.11:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.12:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.13:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:1.9.14:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.0.0:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.0.3:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.0.4:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.0.5:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.1.0:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.1.2:*:*:*:*:*:*:*

More vulnerabilities in Moodle

CVE-2006-4935 — Critical (CVSS 10.0): The Database module in Moodle before 1.6.2 does not properly handle uploaded files, which has unspecified impact and…
CVE-2006-4936 — Critical (CVSS 10.0): Moodle before 1.6.2 does not properly validate the module instance id when creating a course module object, which has…
CVE-2005-2247 — Critical (CVSS 10.0): Multiple unknown vulnerabilities in Moodle before 1.5.1 have unknown impact and attack vectors.
CVE-2004-2233 — Critical (CVSS 10.0): Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors.
CVE-2004-2236 — Critical (CVSS 10.0): Unknown vulnerability in Moodle before 1.3.3 has unknown impact and attack vectors, related to language setting.
CVE-2004-2237 — Critical (CVSS 10.0): Unknown vulnerability in Moodle before 1.3.4 has unknown impact and attack vectors, related to "strings in Moodle…

All CVEs affecting Moodle →

Other CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities

CVE-2026-27604 — Critical (CVSS 10.0): FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version…
CVE-2026-40965 — Critical (CVSS 10.0): Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a…
CVE-2026-42826 — Critical (CVSS 10.0): Exposure of sensitive information to an unauthorized actor in Azure DevOps allows an unauthorized attacker to disclose…
CVE-2025-29270 — Critical (CVSS 10.0): Incorrect access control in the realtime.cgi endpoint of Deep Sea Electronics devices DSE855 v1.1.0 to v1.1.26 allows…
CVE-2025-61481 — Critical (CVSS 10.0): An issue in MikroTik RouterOS v.7.14.2 and SwOS v.2.18 exposes the WebFig management interface over cleartext HTTP by…
CVE-2025-53624 — Critical (CVSS 10.0): The Docusaurus gists plugin adds a page to your Docusaurus instance, displaying all public gists of a GitHub user.…

Browse all CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities →