CVE-2026-30884
Cross-course read and tamper of certificate data in Moodle mod_customcert.
Is CVE-2026-30884 being exploited?
Not confirmed. CVE-2026-30884 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.17% probability of exploitation in the next 30 days.
How severe is CVE-2026-30884?
CVE-2026-30884 is rated Critical with a CVSS score of 9.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-30884?
Yes. A fix has been recorded for CVE-2026-30884. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-30884 affect?
CVE-2026-30884 affects Moodle LMS (moodle-mod_customcert), moodle-mod_customcert plugin (<4.4.9, <5.0.3). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-30884?
Upgrade to 4.4.9 or 5.0.3+ immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthorized cross-course read and silent tampering of certificate elements via unvalidated elementid.
Patch when possible
- affected< 4.4.9
- affected>= 5.0.0 and < 5.0.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.