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Fencer Vulns
medium 5.3

CVE-2021-43560 json

Moodle Insecure direct object reference (IDOR) in a calendar web service

published 2021-11-22 4 y ago modified 2026-09-08 2 mo ago also BIT-moodle-2021-43560 , EUVD-2022-3872 , GHSA-g39c-mccf-rxjv

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. Insufficient capability checks made it possible to fetch other users' calendar action events.

Patch / fix

  • packagist moodle/moodle 3.9.11, 3.10.8, 3.11.4
  • bitnami moodle 3.8.9, 3.9.11, 3.10.8, 3.11.4
  • moodle moodle 3.9.11, 3.10.8, 3.11.4

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-2021-43560 updated

moodle: IDOR in a calendar web service allows fetching of other users' action events

  • 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

1.13% chance of exploitation in the next 30 days, higher than 66% 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
>=3.9, <3.9.11
>=3.10, <3.10.8
>=3.11, <3.11.4
3.9.11
3.10.8
3.11.4
bitnami moodle
<3.8.9
>=3.9.0, <3.9.11
>=3.10.0, <3.10.8
>=3.11.0, <3.11.4
3.8.9
3.9.11
3.10.8
3.11.4

Affected products

  • n/a moodle

Classification

Weakness
  • CWE-863 Incorrect Authorization
  • CWE-668 Exposure of Resource to Wrong Sphere

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.