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MEDIUM severity

CVE-2019-3850 — moodle

MEDIUMFix: moodle/moodle@1fc481d

CVE-2019-3850 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in moodle/moodle. A fix is available for moodle/moodle — see the affected versions and patch details below.

Moodle Stored HTML in assignment submission comments allowed links to be opened directly

Also known asGHSA-3fj7-9j8m-7r8g
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk+0.13%
Lower risk than most CVEs61th percentile — riskier than 61% of all scored CVEsHighest risk
0.00%0.48%0.96%1.45%0.1%0.9%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 vulnerability was found in moodle before versions 3.6.3, 3.5.5, 3.4.8 and 3.1.17. Links within assignment submission comments would open directly (in the same window). Although links themselves may be valid, opening within the same window and without the no-referrer header policy made them more susceptible to exploits.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmoodle/moodleall versions3.1.17composer require moodle/moodle:^3.1.17
🐘Packagistmoodle/moodle≥ 3.2.0&&< 3.4.83.4.8composer require moodle/moodle:^3.4.8
🐘Packagistmoodle/moodle≥ 3.5.0&&< 3.5.53.5.5composer require moodle/moodle:^3.5.5
🐘Packagistmoodle/moodle≥ 3.6.0&&< 3.6.33.6.3composer require moodle/moodle:^3.6.3

Affected Products

1 product · 4 configurations
Application
moodlemoodle
≥ 3.6.0 && < 3.6.3
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 3.1.17 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-3850 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Frequently Asked Questions

A vulnerability was found in moodle before versions 3.6.3, 3.5.5, 3.4.8 and 3.1.17. Links within assignment submission comments would open directly (in the same window). Although links themselves may be valid, opening within the same window and without the no-referrer header policy made them more susceptible to exploits.
O3 Security · Impact-Aware SCA

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CVE-2019-3850: moodle — Fixed in 3.1.17