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CRITICAL severity

Moodle vulnerable to RCE via unsafe deserializationGHSA-8jhp-2gcr-qw96

CRITICALFix: moodle/moodle@58e8ad8

GHSA-8jhp-2gcr-qw96 is a critical-severity (CVSS 9.8) Improper Input Validation vulnerability in moodle/moodle. A fix is available for moodle/moodle — see the affected versions and patch details below.

Also known asBIT-moodle-2021-3943CVE-2021-3943
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Oct 13, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.4%probability of exploitation in next 30 days
Lower Risk-0.07%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk
0.69%1.45%2.20%2.96%1.2%2.4%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-8jhp-2gcr-qw96 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

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. A remote code execution risk when restoring backup files was identified.

Affected Packages

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

Affected Products

1 product · 3 configurations
Application
moodlemoodle
≥ 3.11.0 && ≤ 3.11.3
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 3.11.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8jhp-2gcr-qw96 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

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. A remote code execution risk when restoring backup files was identified.
O3 Security · Impact-Aware SCA

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Moodle vulnerable to RCE via unsafe deserialization