CVE-2019-3850

Severity: medium (CVSS 6.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-03-26 · updated 2026-06-17
Weakness: CWE-601

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 products

Moodle: before 3.1.17; from 3.4.0 before 3.4.8; from 3.5.0 before 3.5.5; from 3.6.0 before 3.6.3 — fixed in 3.1.17, 3.4.8, 3.5.5, 3.6.3

How to fix

Upgrade to a fixed version: Moodle 3.1.17, 3.4.8, 3.5.5, 3.6.3. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3850
https://moodle.org/mod/forum/discuss.php?d=384013#p1547745
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3850
https://moodle.org/mod/forum/discuss.php?d=384013#p1547745

Get alerted when CVE-2019-3850 or the next vulnerability affects your stack