CVE-2026-30884
March 18, 2026
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.
Affected Packages
https://github.com/mdjnelson/moodle-mod_customcert.git (GITHUB):
Affected version(s) >=v5.0.0 <v5.0.3Fix Suggestion:
Update to version v5.0.3https://github.com/mdjnelson/moodle-mod_customcert.git (GITHUB):
Affected version(s) >=v3.1.11 <v4.4.9Fix Suggestion:
Update to version v4.4.9Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key
EPSS
Base Score:
0.02
