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Not in CISA KEV
HIGH severity

CVE-2018-16854 — moodle

HIGH

CVE-2018-16854 is a high-severity (CVSS 8.8) Cross-Site Request Forgery (CSRF) vulnerability in moodle/moodle. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for moodle/moodle — see the affected versions and patch details below.

Moodle Login CSRF vulnerability in login form

Also known asGHSA-xj5f-qv37-r9jc
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
2 known
Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk
0.68%1.39%2.11%2.83%1.2%2.3%May 26Aug 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

4 pkgs affected
🐘moodle/moodle🐘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 versions 3.5 to 3.5.2, 3.4 to 3.4.5, 3.3 to 3.3.8, 3.1 to 3.1.14 and earlier. The login form is not protected by a token to prevent login cross-site request forgery. Fixed versions include 3.6, 3.5.3, 3.4.6, 3.3.9 and 3.1.15.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmoodle/moodle≥ 3.1&&< 3.1.153.1.15composer require moodle/moodle:^3.1.15
🐘Packagistmoodle/moodle≥ 3.3&&< 3.3.93.3.9composer require moodle/moodle:^3.3.9
🐘Packagistmoodle/moodle≥ 3.4&&< 3.4.63.4.6composer require moodle/moodle:^3.4.6
🐘Packagistmoodle/moodle≥ 3.5&&< 3.5.33.5.3composer require moodle/moodle:^3.5.3

Affected Products

1 product · 5 configurations
Application
moodlemoodle
≥ 3.5.0 && ≤ 3.0.10
range
Exploits & PoCs
2

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A flaw was found in moodle versions 3.5 to 3.5.2, 3.4 to 3.4.5, 3.3 to 3…

github.comGithubApr 2019

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 3.1.15 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-16854 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 versions 3.5 to 3.5.2, 3.4 to 3.4.5, 3.3 to 3.3.8, 3.1 to 3.1.14 and earlier. The login form is not protected by a token to prevent login cross-site request forgery. Fixed versions include 3.6, 3.5.3, 3.4.6, 3.3.9 and 3.1.15.
O3 Security · Impact-Aware SCA

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CVE-2018-16854: moodle CSRF — Fixed in 3.1.15