mdjnelson/moodle-mod_customcert Vulnerable to Authorization Bypass Through User-Controlled Key

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Summary

CVECVE-2026-30884
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-18 04:17:18 UTC
Updated2026-04-16 14:46:24 UTC
Descriptionmdjnelson/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.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS: 0.000200000 probability, percentile 0.055340000 (date 2026-04-21)

Problem Types: CWE-639 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mdjnelson Moodle-mod Customcert affected < 4.4.9 Not specified
CNA Mdjnelson Moodle-mod Customcert affected >= 5.0.0, < 5.0.3 Not specified

References

ReferenceSourceLinkTags
github.com/mdjnelson/moodle-mod_customcert/commit/ddc8f01f1e19fb61202f60... [email protected] github.com
github.com/mdjnelson/moodle-mod_customcert/security/advisories/GHSA-8pjr... [email protected] github.com
github.com/mdjnelson/moodle-mod_customcert/commit/a1494a80fb953f187f7888... [email protected] github.com
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