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Fencer Vulns
medium 5.3

CVE-2021-20281 json

Moodle allowed some users without permission to view other users' full names

published 2021-03-15 5 y ago modified 2026-09-08 2 mo ago also BIT-moodle-2021-20281 , EUVD-2021-0636 , GHSA-93wh-35r4-6qmw

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

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.

Patch / fix

  • packagist moodle/moodle 3.5.17, 3.8.8, 3.9.5, 3.10.2
  • bitnami moodle 3.5.17, 3.8.8, 3.9.5, 3.10.2
  • moodle moodle 3.5.17, 3.8.8, 3.9.5, 3.10.2

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-20281 updated

moodle: User full name disclosure within online users block

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.36% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
packagist moodle/moodle
>=3.10.0, <3.10.2
>=3.9.0, <3.9.5
>=3.8.0, <3.8.8
>=3.5, <3.5.17
3.10.2
3.9.5
3.8.8
3.5.17
bitnami moodle
>=3.5.0, <3.5.17
>=3.8.0, <3.8.8
>=3.9.0, <3.9.5
>=3.10.0, <3.10.2
3.5.17
3.8.8
3.9.5
3.10.2

Affected products

  • n/a moodle

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-863 Incorrect Authorization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.