EUVD-2026-12745
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Lifecycle Timeline
3Description
mdjnelson/moodle-mod_customcert is a Moodle plugin for creating dynamically generated certificates with complete customization via the web browser. Prior to versions 4.4.9 and 5.0.3, a teacher who holds `mod/customcert:manage` in any single course can read and silently overwrite certificate elements belonging to any other course in the Moodle installation. The `core_get_fragment` callback `editelement` and the `mod_customcert_save_element` web service both fail to verify that the supplied `elementid` belongs to the authorized context, enabling cross-course information disclosure and data tampering. Versions 4.4.9 and 5.0.3 fix the issue.
Analysis
Cross-course privilege escalation in Moodle Mod Customcert allows authenticated teachers with certificate management rights in any course to read and modify certificate data across the entire Moodle installation due to missing context validation in the editelement callback and save_element web service. An attacker with mod/customcert:manage permissions in a single course can exploit this to disclose sensitive certificate information from other courses or tamper with their certificate elements. …
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Remediation
Within 24 hours: Identify all Moodle instances running mod_customcert versions prior to 4.4.9 or 5.0.3 and disable the plugin or restrict teacher access to only trusted administrators. Within 7 days: Audit logs for unauthorized certificate element access or modifications and assess exposed data scope. …
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