What is CVE-2025-67853?

CVE-2025-67853 is a high-severity vulnerability in Moodle, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 7.5/10. Published 2026-02-03.

How severe is CVE-2025-67853?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Moodle

CVE-2025-67853

A flaw was found in Moodle. A remote attacker could exploit a lack of proper rate limiting in the confirmation email service. This vulnerability allows attackers to more easily enumerate or guess user credentials, facilitating brute-force attacks against user accounts.

EPSS: 0.004 (34.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Moodle — versions 5.1.0

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

References

patrick@puiterwijk.org (x_refsource_REDHAT, Third Party Advisory, vdb-entry)
patrick@puiterwijk.org (x_refsource_REDHAT, issue-tracking, Third Party Advisory)

Frequently asked questions

What is CVE-2025-67853?: CVE-2025-67853 is a high-severity vulnerability in Moodle, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 7.5/10. Published 2026-02-03.
How severe is CVE-2025-67853?: High severity. CVSS v3 base score is 7.5 out of 10.