CVE-2021-20282

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-15 · updated 2026-06-17
Weakness: CWE-863

Description

When creating a user account, it was possible to verify the account without having access to the verification email link/secret in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.

Affected products

Fedoraproject Fedora: 32, 34
Moodle: from 3.5.0 before 3.5.17; from 3.8.0 before 3.8.8; from 3.9.0 before 3.9.5; from 3.10.0 before 3.10.2 — fixed in 3.10.2, 3.5.17, 3.8.8, 3.9.5

How to fix

Upgrade to a fixed version: Moodle 3.10.2, 3.5.17, 3.8.8, 3.9.5. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1939046
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AFSNJ7XHVTC52RSRX2GBQFF3VEEAY2MS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UFH5DDMU5TZ3JT4Q52WMRAHACA5MHIMT/
https://moodle.org/mod/forum/discuss.php?d=419653
https://bugzilla.redhat.com/show_bug.cgi?id=1939046
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AFSNJ7XHVTC52RSRX2GBQFF3VEEAY2MS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UFH5DDMU5TZ3JT4Q52WMRAHACA5MHIMT/
https://moodle.org/mod/forum/discuss.php?d=419653

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