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MEDIUM severity

CVE-2021-43560 — moodle

MEDIUM

CVE-2021-43560 is a medium-severity (CVSS 5.3) CWE-863 vulnerability in moodle/moodle. A fix is available for moodle/moodle — see the affected versions and patch details below.

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

Also known asBIT-moodle-2021-43560GHSA-g39c-mccf-rxjv
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs66th percentile — riskier than 66% of all scored CVEsHighest risk
0.00%0.54%1.08%1.63%0.2%1.1%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

3 pkgs affected
🐘moodle/moodle🐘moodle/moodle🐘moodle/moodle

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmoodle/moodle≥ 3.9&&< 3.9.113.9.11composer require moodle/moodle:^3.9.11
🐘Packagistmoodle/moodle≥ 3.10&&< 3.10.83.10.8composer require moodle/moodle:^3.10.8
🐘Packagistmoodle/moodle≥ 3.11&&< 3.11.43.11.4composer require moodle/moodle:^3.11.4

Affected Products

3 products · 6 configurations
Application
extra packages for enterprise linuxfedoraproject
1 version
7.0
OS
fedorafedoraproject
1 version
35
Application
moodlemoodle
≥ 3.11.0 && ≤ 3.8.8
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for moodle/moodle, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update moodle/moodle to 3.9.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-43560 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2021-43560: moodle — Fixed in 3.9.11