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Fencer Vulns
medium 4.3

CVE-2023-28334 json

Moodle: users' name enumeration possible via idor on learning plans page

published 2023-03-23 3 y ago modified 2026-09-08 2 mo ago also BIT-moodle-2023-28334 , EUVD-2023-1034 , GHSA-hh52-g5c4-wprh

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

Authenticated users were able to enumerate other users' names via the learning plans page.

Patch / fix

  • packagist moodle/moodle 3.9.20, 3.11.13, 4.0.7, 4.1.2
  • bitnami moodle 4.0.7, 4.1.2
  • moodle moodle 4.0.7, 4.1.2

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-2023-28334 updated

moodle: Users' name enumeration possible via IDOR on learning plans page

  • 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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
GitHub 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
OSV 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
packagist moodle/moodle
>=4.1.0, <4.1.2
>=4.0.0, <4.0.7
>=3.11.0, <3.11.13
<3.9.20
4.1.2
4.0.7
3.11.13
3.9.20
bitnami moodle
>=4.0.0, <4.0.7
>=4.1.0, <4.1.2
4.0.7
4.1.2

Affected products

  • moodle moodle

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-639 Authorization Bypass Through User-Controlled Key

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.