CVE-2021-20283
Missing permission check in Moodle
The web service responsible for fetching other users' enrolled courses did not validate that the requesting user had permission to view that information in each course in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
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
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
The web service responsible for fetching other users' enrolled courses did not validate that the requesting user had permission to view that information in each course in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
- Record
CVE-2021-20283- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:P/I:N/A:N - Weakness
- CWE-863, CWE-862
- Updated
- 2026-11-02
CVE List No score
The web service responsible for fetching other users' enrolled courses did not validate that the requesting user had permission to view that information in each course in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
- Record
CVE-2021-20283- Weakness
- CWE-863
- Updated
- 2026-11-02
EUVDEUVD-2022-2009 No score
The web service responsible for fetching other users' enrolled courses did not validate that the requesting user had permission to view that information in each course in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
- Record
EUVD-2022-2009- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2m72-m5cw-3g9h
Missing permission check in Moodle
The web service responsible for fetching other users' enrolled courses did not validate that the requesting user had permission to view that information in each course in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
- Record
GHSA-2m72-m5cw-3g9h- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-862, CWE-863
- Updated
- 2026-11-02
OSV
The web service responsible for fetching other users' enrolled courses did not validate that the requesting user had permission to view that information in each course in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
- Record
CVE-2021-20283- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-2m72-m5cw-3g9h
Missing permission check in Moodle
The web service responsible for fetching other users' enrolled courses did not validate that the requesting user had permission to view that information in each course in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
- Record
GHSA-2m72-m5cw-3g9h- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-862, CWE-863
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-20283
The web service responsible for fetching other users' enrolled courses did not validate that the requesting user had permission to view that information in each course in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
- Record
UBUNTU-CVE-2021-20283- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - Updated
- 2026-11-02
OSVBIT-moodle-2021-20283 No score
The web service responsible for fetching other users' enrolled courses did not validate that the requesting user had permission to view that information in each course in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
- Record
BIT-moodle-2021-20283- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
moodle/moodlePackagist |
3.10.0 up to 3.10.2 | 3.10.2 |
moodle/moodlePackagist |
3.9.0 up to 3.9.5 | 3.9.5 |
moodle/moodlePackagist |
3.8.0 up to 3.8.8 | 3.8.8 |
moodle/moodlePackagist |
before 3.5.17 | 3.5.17 |
moodleBitnami |
3.5.0 up to 3.5.17, 3.8.0 up to 3.8.8, 3.9.0 up to 3.9.5, 3.10.0 up to 3.10.2 | 3.5.173.8.83.9.53.10.2 |
moodle/moodlePackagist |
3.10.0 up to 3.10.2, plus listed versions v3.10.0v3.10.1 |
3.10.2 |
moodle/moodlePackagist |
3.9.0 up to 3.9.5, plus listed versions v3.9.0v3.9.1v3.9.2v3.9.3v3.9.4 |
3.9.5 |
moodle/moodlePackagist |
3.8.0 up to 3.8.8, plus listed versions v3.8.0v3.8.1v3.8.2v3.8.3v3.8.4v3.8.5v3.8.6v3.8.7 |
3.8.8 |
moodle/moodlePackagist |
before 3.5.17, plus listed versions v2.3.10v2.3.11v2.3.4v2.3.5v2.3.6 Show 45 moreShow lessv2.3.7v2.3.8v2.3.9v2.4.0v2.4.0-rc1v2.4.1v2.4.10v2.4.11v2.4.2v2.4.3v2.4.4v2.4.5v2.4.6v2.4.7v2.4.8v2.4.9v2.5.0v2.5.0-betav2.5.0-rc1v2.5.1v2.5.2v2.5.3v2.5.4v2.5.5v2.5.6v2.5.7v2.5.8v2.5.9v2.6.0v2.6.0-betav2.6.0-rc1v2.6.1v2.6.10v2.6.11v2.6.2v2.6.3v2.6.4v2.6.5v2.6.6v2.6.7v2.6.8v2.6.9v2.7.0v2.7.0-betav2.7.0-rc1 |
3.5.17 |
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-2021-20283 is a medium vulnerability (CVSS 4.3) in Moodle, published March 15, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.11%, the 66th percentile. Fixed in moodle/moodle 3.10.2.
References
bugzilla.redhat.com/show_bug.cgi?id=1939051
moodle.org/mod/forum/discuss.php?d=419654
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AFSNJ7XHVTC52RSRX2GBQFF3VEEAY2MS
nvd.nist.gov/vuln/detail/CVE-2021-20283
Left out here: 151 versions. The JSON record has them.