Moodle type juggling vulnerability

published 2022-01-21 4 y ago modified 2026-09-08 2 mo ago also BIT-moodle-2021-40693 , EUVD-2022-6665 , GHSA-2jxg-mv2m-j4r7

cvss: 6.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits: 0; none known

An authentication bypass risk was identified in the external database authentication functionality, due to a type juggling vulnerability.

Patch / fix

fixed in 3

packagist moodle/moodle 3.9.10, 3.10.7, 3.11.3
bitnami moodle 3.9.10, 3.10.7, 3.11.3
moodle moodle 3.9.10, 3.10.7, 3.11.3

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-40693 updated 2025-11-21 cvss 7.5

moodle: authentication bypass risk when using external database

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
GitHub	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
OSV	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	moodle/moodle	>=3.9, <3.9.10 >=3.10, <3.10.7 >=3.11, <3.11.3	3.9.10 3.10.7 3.11.3
bitnami	moodle	<3.9.10 >=3.10.0, <3.10.7 >=3.11.0, <3.11.3	3.9.10 3.10.7 3.11.3

Affected products

n/a moodle

Classification

Weakness

CWE-287 Improper Authentication

References

bugzilla.redhat.com /show_bug.cgi?id=2043417
web, issue-tracking, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2021-40693
advisory, web
github.com /moodle/moodle
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary