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Vulnerability record · CVE-2019-3809 · published 25 March 2019

CVE-2019-3809: Moodle cross-site request forgery vulnerability

Moodle · Moodle

A flaw was found in Moodle versions 3.1 to 3.1.15 and earlier unsupported versions. The mybackpack functionality allowed setting the URL of badges, when it should be restricted to the Mozilla Open Badges backpack URL. This resulted in the possibility of blind SSRF via requests made by the page.

10.0 CVSS 3.0 Critical EPSS 0.86% · top 43.1% CWE-352 · Cross-site request forgeryCWE-918 · Server-side request forgery (SSRF)
10.0CVSS 3.0 base score, v2 7.5
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

A flaw was found in Moodle versions 3.1 to 3.1.15 and earlier unsupported versions. The mybackpack functionality allowed setting the URL of badges, when it should be restricted to the Mozilla Open Badges backpack URL. This resulted in the possibility of blind SSRF via requests made by the page.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-64222 PatchVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3809 Issue TrackingPatchThird Party Advisory
https://moodle.org/mod/forum/discuss.php?d=381229#p1536766 PatchVendor Advisory
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-64222 PatchVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3809 Issue TrackingPatchThird Party Advisory
https://moodle.org/mod/forum/discuss.php?d=381229#p1536766 PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2006-4935Moodle improper input validation vulnerabilityThe Database module in Moodle before 1.6.2 does not properly handle uploaded files, which has unspecified impact and remote attack vectors.EPSS 1.5%10.0CVE-2006-4936Moodle improper input validation vulnerabilityMoodle before 1.6.2 does not properly validate the module instance id when creating a course module object, which has unspecified impact and remote a…EPSS 1.5%10.0CVE-2005-2247Moodle vulnerabilityMultiple unknown vulnerabilities in Moodle before 1.5.1 have unknown impact and attack vectors.EPSS 1.5%10.0CVE-2004-2233Moodle vulnerabilityUnknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors.EPSS 1.7%10.0CVE-2004-2235Moodle vulnerabilityUnknown vulnerability in Moodle before 1.2 has unknown impact and attack vectors, related to improper filtering of text.EPSS 1.4%10.0CVE-2004-2236Moodle vulnerabilityUnknown vulnerability in Moodle before 1.3.3 has unknown impact and attack vectors, related to language setting.EPSS 1.4%10.0CVE-2004-2237Moodle vulnerabilityUnknown vulnerability in Moodle before 1.3.4 has unknown impact and attack vectors, related to "strings in Moodle texts."EPSS 1.7%9.8CVE-2025-67856Moodle incorrect authorization vulnerabilityA flaw was found in Moodle. An authorization logic flaw, specifically due to incomplete role checks during the badge awarding process, allowed badges…EPSS 0.29%

Source: NIST National Vulnerability Database (record CVE-2019-3809), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.