Information disclosure in moodle
Priority LOW 27CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure, Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-200 and CWE-863.
Summary
It was possible for some users without permission to view other users' full names to do so via the online users block in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
Why it matters now
EPSS 0.01361 71st percentileScored 2026-11-07
Fix Fixed moodle/moodle (Packagist): 3.10.2, 3.9.5, 3.8.8 +1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | moodle | Fixed in 3.10.2, 3.9.5, 3.8.8, 3.5.17 | — | No fix listed | CNA |
| — | moodle/moodle (Packagist) | 3.10.0 to before 3.10.2 | 3.10.2 | Patch available | GHSA-93wh-35r4-6qmw |
| — | moodle/moodle (Packagist) | 3.9.0 to before 3.9.5 | 3.9.5 | Patch available | GHSA-93wh-35r4-6qmw |
| — | moodle/moodle (Packagist) | 3.8.0 to before 3.8.8 | 3.8.8 | Patch available | GHSA-93wh-35r4-6qmw |
| — | moodle/moodle (Packagist) | 3.5 to before 3.5.17 | 3.5.17 | Patch available | GHSA-93wh-35r4-6qmw |
- moodle Vendor— Affected Fixed in 3.10.2, 3.9.5, 3.8.8, 3.5.17 Fixed in — No fix listed CNA
- moodle/moodle (Packagist) Vendor— Affected 3.10.0 to before 3.10.2 Fixed in 3.10.2 Patch available GHSA-93wh-35r4-6qmw
- moodle/moodle (Packagist) Vendor— Affected 3.9.0 to before 3.9.5 Fixed in 3.9.5 Patch available GHSA-93wh-35r4-6qmw
- moodle/moodle (Packagist) Vendor— Affected 3.8.0 to before 3.8.8 Fixed in 3.8.8 Patch available GHSA-93wh-35r4-6qmw
- moodle/moodle (Packagist) Vendor— Affected 3.5 to before 3.5.17 Fixed in 3.5.17 Patch available GHSA-93wh-35r4-6qmw
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* | 3.5.0 to before 3.5.17; 3.8.0 to before 3.8.8; 3.9.0 to before 3.9.5; 3.10.0 to before 3.10.2 | Vulnerable | Moodle |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
- cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* Versions 3.5.0 to before 3.5.17; 3.8.0 to before 3.8.8; 3.9.0 to before 3.9.5; 3.10.0 to before 3.10.2 Vulnerable ·Moodle
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
Remediation
- Fix · GHSA-93wh-35r4-6qmw moodle/moodle (Packagist) Fixed in 3.10.2 Advisory →
- Fix · GHSA-93wh-35r4-6qmw moodle/moodle (Packagist) Fixed in 3.9.5 Advisory →
- Fix · GHSA-93wh-35r4-6qmw moodle/moodle (Packagist) Fixed in 3.8.8 Advisory →
- Fix · GHSA-93wh-35r4-6qmw moodle/moodle (Packagist) Fixed in 3.5.17 Advisory →
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
moodle — FEDORA-2021-1c27e89d49
5 records Highest priority Priority LOW 5 LOW
Other records, highest priority first
- TI-2021-03573 Incorrect authorization in moodlePriority LOW 27
- TI-2021-03571 Cross-site scripting in moodlePriority LOW 27
- TI-2021-03570 Cross-site scripting in moodlePriority LOW 26
- Advisory ·
moodle — FEDORA-2021-50f63a0161
5 records Highest priority Priority LOW 5 LOW
Other records, highest priority first
- TI-2021-03573 Incorrect authorization in moodlePriority LOW 27
- TI-2021-03571 Cross-site scripting in moodlePriority LOW 27
- TI-2021-03570 Cross-site scripting in moodlePriority LOW 26
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20281
- 2026-10-03 Alias added: GHSA-93wh-35r4-6qmw
References
Advisory 4
Other 4
- https://github.com/moodle/moodle/commit/33d6017287e1835513a3de8edd3fbf7a6a90af9c
- https://github.com/moodle/moodle
- https://lists.fedoraproject.org/archives/list/[email protected]/message/AFSNJ7XHVTC52RSRX2GBQFF3VEEAY2MS
- https://lists.fedoraproject.org/archives/list/[email protected]/message/UFH5DDMU5TZ3JT4Q52WMRAHACA5MHIMT
Sources
- CVE-2021-20281 · CVE Program
- CVE-2021-20281 · NVD
- FIRST EPSS
- GHSA-93wh-35r4-6qmw · GitHub Advisory Database · CC BY 4.0
- CVE-2021-20281 · Red Hat security data · CC BY 4.0
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