What is CVE-2016-8643?

CVE-2016-8643 is a medium-severity vulnerability in Moodle, classified under Improper Access Control. CVSS score: 4.3/10. Published 2017-01-20.

How severe is CVE-2016-8643?

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

Vulnerability in Moodle

CVE-2016-8643

In Moodle 2.x and 3.x, non-admin site managers may accidentally edit admins via web services.

Published 2017-01-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (50.8th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Moodle — versions 2.8.0, 2.8.1, 2.8.2
Moodle 2.x And 3.x — versions Moodle 2.x and 3.x

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

www.securityfocus.com/bid/94457 (VDB Entry, Third Party Advisory, vdb-entry)
moodle.org/mod/forum/discuss.php (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2016-8643?: CVE-2016-8643 is a medium-severity vulnerability in Moodle, classified under Improper Access Control. CVSS score: 4.3/10. Published 2017-01-20.
How severe is CVE-2016-8643?: Medium severity. CVSS v3 base score is 4.3 out of 10.