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CVE

CVE-2026-30884

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

CVE-2026-30884

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

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 coregetfragment callback editelement and the modcustomcertsave_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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30884.json, https://github.com/mdjnelson/moodle-modcustomcert/security/advisories/GHSA-8pjr-j7r4-ccjx, https://nvd.nist.gov/vuln/detail/CVE-2026-30884, https://github.com/mdjnelson/moodle-modcustomcert/commit/a1494a80fb953f187f7888a7394cbf9d13c28468, https://github.com/mdjnelson/moodle-mod_customcert/commit/ddc8f01f1e19fb61202f6013a38ef757486d3ba0

Severity

9.6

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
9.6
EPSS Probability
0.00018%
EPSS Percentile
0.04264%
Introduced Version
0,8484023762a14c5602b5db9cef6401aba95077e4
Fix Available
74b972034ecac6f1bd106b27d06c5e24b8a7f8c1,e0388cecce8810d1a6121da4ec4a475b49a760ee

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