Is CVE-2026-30884 actively exploited?

No active exploitation of CVE-2026-30884 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-30884 be exploited remotely?

Yes. CVE-2026-30884 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-30884?

CVE-2026-30884 has a CVSS score of 9.6 (CRITICAL).

HOME VULNERABILITIESCVE-2026-30884

CRITICAL

CVE-2026-30884

CWE-639Published: March 18, 2026· Updated: Mar 18, 2026

9.6

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:3.3th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-30884 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.6.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.