What is CVE-2025-67857?

CVE-2025-67857 is a medium-severity vulnerability in Moodle, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 4.3/10. Published 2026-02-03.

How severe is CVE-2025-67857?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Moodle

CVE-2025-67857

A flaw was found in moodle. During anonymous assignment submissions, user identifiers were inadvertently exposed in URLs. This data exposure allows unauthorized viewers to see internal user IDs, compromising the intended anonymity and potentially leading to information disclosure.

EPSS: 0.003 (23.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

Affected products

Moodle — versions 5.1.0

Weakness classification (CWE)

CWE-201 — Insertion of Sensitive Information into Sent Data

References

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

Frequently asked questions

What is CVE-2025-67857?: CVE-2025-67857 is a medium-severity vulnerability in Moodle, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 4.3/10. Published 2026-02-03.
How severe is CVE-2025-67857?: Medium severity. CVSS v3 base score is 4.3 out of 10.