CVE-2020-25628

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-08 · updated 2026-06-17
Weakness: CWE-79

Description

The filter in the tag manager required extra sanitizing to prevent a reflected XSS risk. This affects 3.9 to 3.9.1, 3.8 to 3.8.4, 3.7 to 3.7.7, 3.5 to 3.5.13 and earlier unsupported versions. Fixed in 3.9.2, 3.8.5, 3.7.8 and 3.5.14.

Affected products

Moodle: from 3.5.0 before 3.5.14; from 3.7.0 before 3.7.8; from 3.8.0 before 3.8.5; from 3.9.0 before 3.9.2 — fixed in 3.5.14, 3.7.8, 3.8.5, 3.9.2

How to fix

Upgrade to a fixed version: Moodle 3.5.14, 3.7.8, 3.8.5, 3.9.2. Check the vendor advisory for mitigations.

References

http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-69340
https://moodle.org/mod/forum/discuss.php?d=410840
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-69340
https://moodle.org/mod/forum/discuss.php?d=410840

Get alerted when CVE-2020-25628 or the next vulnerability affects your stack