ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-30884

mdjnelson/moodle-mod_customcert is a Moodle plugin for creating dynamically generated certificates with complete customization via the web browser.

Published Mar 18, 2026 · catalog updated Jun 17, 2026 · mdjnelson/moodle-mod_customcert is a Moodle

Check if you run it

No confirmed exploitation is on record for CVE-2026-30884. EPSS is 0.30%. Act only if a listed version of mdjnelson/moodle-mod_customcert is a Moodle is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (mdjnelson/moodle-mod_customcert is a Moodle).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.30%
Remediation
Advisory link
Affected products
See sources for product scope

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 in any single course can read and silently overwrite certificate elements belonging to any other course in the Moodle installation. The callback and the web service both fail to verify that the supplied belongs to the authorized context, enabling cross-course information disclosure and data tampering. Versions 4.4.9 and 5.0.3 fix the issue.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-30884

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-30884. EPSS is 0.30%. Act only if a listed version of mdjnelson/moodle-mod_customcert is a Moodle is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-639: Authorization Bypass Through User-Controlled Key. EPSS 0.30%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 18, 2026 · NIST NVD

    Detected

    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 in any single course can read and silently overwrite certificate elements belonging to any other course in the Moodle installation. The callback and the web service both fail to verify that the sup

  2. Jun 17, 2026 · NIST NVD

    Updated

    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 in any single course can read and silently overwrite certificate elements belonging to any other course in the Moodle installation. The callback and the web service both fail to verify that the sup

Sources

  • CVE.orgVulnerability recordCVE-2026-30884

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-30884

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-30884

    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 in any single course can read and silently overwrite

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.