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Fencer Intel
medium 4.3

CVE-2021-20184 json

Moodle Grade information disclosure in grade's external fetch functions

published 5y ago modified 2mo ago also BIT-moodle-2021-20184 , EUVD-2022-4587 , GHSA-mm73-86f9-5x5c

cvss
4.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

It was found in Moodle before version 3.10.1, 3.9.4 and 3.8.7 that a insufficient capability checks in some grade related web services meant students were able to view other students grades.

Patch / fix

  • packagist moodle/moodle 3.8.7, 3.9.4, 3.10.1
  • bitnami moodle 3.8.7, 3.9.4, 3.10.1
  • moodle moodle 3.8.7, 3.9.4, 3.10.1

Is CVE-2021-20184 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
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
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:P/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
>=3.8, <3.8.7
>=3.9, <3.9.4
>=3.10, <3.10.1
3.8.7
3.9.4
3.10.1
bitnami moodle
<3.8.7
>=3.9.0, <3.9.4
>=3.10.0, <3.10.1
3.8.7
3.9.4
3.10.1

Affected products

  • n/a moodle

Classification

Weakness
  • CWE-354 Improper Validation of Integrity Check Value

References

Sources

Fencer Intel 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.