CVE-2021-40693
Moodle type juggling vulnerability
An authentication bypass risk was identified in the external database authentication functionality, due to a type juggling vulnerability.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
An authentication bypass risk was identified in the external database authentication functionality, due to a type juggling vulnerability.
- Record
CVE-2021-40693- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
CVE List No score
An authentication bypass risk was identified in the external database authentication functionality, due to a type juggling vulnerability.
- Record
CVE-2021-40693- Updated
- 2026-11-02
EUVDEUVD-2022-6665 No score
An authentication bypass risk was identified in the external database authentication functionality, due to a type juggling vulnerability.
- Record
EUVD-2022-6665- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2jxg-mv2m-j4r7
Moodle type juggling vulnerability
An authentication bypass risk was identified in the external database authentication functionality, due to a type juggling vulnerability.
- Record
GHSA-2jxg-mv2m-j4r7- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
OSV
An authentication bypass risk was identified in the external database authentication functionality, due to a type juggling vulnerability.
- Record
CVE-2021-40693- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-2jxg-mv2m-j4r7
Moodle type juggling vulnerability
An authentication bypass risk was identified in the external database authentication functionality, due to a type juggling vulnerability.
- Record
GHSA-2jxg-mv2m-j4r7- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-40693
An authentication bypass risk was identified in the external database authentication functionality, due to a type juggling vulnerability.
- Record
UBUNTU-CVE-2021-40693- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVBIT-moodle-2021-40693 No score
An authentication bypass risk was identified in the external database authentication functionality, due to a type juggling vulnerability.
- Record
BIT-moodle-2021-40693- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
moodle/moodlePackagist |
3.9 up to 3.9.10 | 3.9.10 |
moodle/moodlePackagist |
3.10 up to 3.10.7 | 3.10.7 |
moodle/moodlePackagist |
3.11 up to 3.11.3 | 3.11.3 |
moodleBitnami |
before 3.9.10, 3.10.0 up to 3.10.7, 3.11.0 up to 3.11.3 | 3.9.103.10.73.11.3 |
moodle/moodlePackagist |
3.9 up to 3.9.10, plus listed versions v3.9.0v3.9.0-betav3.9.0-rc1v3.9.0-rc2v3.9.0-rc3 Show 9 moreShow lessv3.9.1v3.9.2v3.9.3v3.9.4v3.9.5v3.9.6v3.9.7v3.9.8v3.9.9 |
3.9.10 |
moodle/moodlePackagist |
3.10 up to 3.10.7, plus listed versions v3.10.0v3.10.0-betav3.10.0-rc1v3.10.0-rc2v3.10.1 Show 5 moreShow lessv3.10.2v3.10.3v3.10.4v3.10.5v3.10.6 |
3.10.7 |
moodle/moodlePackagist |
3.11 up to 3.11.3, plus listed versions v3.11.0v3.11.0-betav3.11.0-rc1v3.11.0-rc2v3.11.1v3.11.2 |
3.11.3 |
moodleUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 2.7.9+dfsg-12.7.10+dfsg-12.7.11+dfsg-12.7.11+dfsg-22.7.12+dfsg-13.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1 |
None known |
moodleUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 3.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-40693 is a medium vulnerability (CVSS 6.5) in Moodle, published January 21, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.80%, the 56th percentile. Fixed in moodle/moodle 3.9.10.