CVE-2023-23921
Moodle Cross-site Scripting vulnerability
6.1
MEDIUM
CVSS 3.1
EPSS 0.29%
Description
The vulnerability was found Moodle which exists due to insufficient sanitization of user-supplied data in some returnurl parameters. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website. This flaw allows a remote attacker to perform cross-site scripting (XSS) attacks.
How to fix CVE-2023-23921
To remediate CVE-2023-23921, upgrade the affected package to a fixed version below.
- —upgrade to 3.9.19 or later
- —upgrade to 3.9.19 or later
Is CVE-2023-23921 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 3.9.0, < 3.9.19, >= 3.11.0, < 3.11.12, >= 4.0.0, < 4.0.6, >= 4.1.0, < 4.1.1
- from 0, < 3.9.19
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |