Vulnerability identifier: #VU51479

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20282

CWE-ID: CWE-288

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moodle
Web applications / Other software

Vendor: moodle.org

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error that allowed newly created users to bypass email verification process without having an access to the verification email link/secret. A remote attacker can register an account with an email address of other users and gain unauthorized access to the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Moodle: 3.10.0 - 3.10.1, 3.9.0 - 3.9.4, 3.8.0 - 3.8.7, 3.7.0 - 3.7.9, 3.6.0 - 3.6.10, 3.5.0 - 3.5.16

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External links
http://moodle.org/mod/forum/discuss.php?d=419653

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.