CVE-2023-23921: Moodle: reflected xss risk in some returnurl parameters
First published: Thu Jan 19 2023(Updated: )
MSA-23-0001: Reflected XSS risk in some returnurl parameters Some returnurl parameters required additional sanitizing to prevent a reflected XSS risk. Versions affected: 4.1, 4.0 to 4.0.5, 3.11 to 3.11.11, 3.9 to 3.9.18 and earlier unsupported versions Versions fixed: 4.1.1, 4.0.6, 3.11.12 and 3.9.19
Credit: patrick@puiterwijk.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Moodle Moodle | >=3.9.0<3.9.19 | |
| Moodle Moodle | >=3.11.0<3.11.12 | |
| Moodle Moodle | >=4.0.0<4.0.6 | |
| Moodle Moodle | =4.1.0 | |
| redhat/moodle | <4.1.1 | 4.1.1 |
| redhat/moodle | <4.0.6 | 4.0.6 |
| redhat/moodle | <3.11.12 | 3.11.12 |
| redhat/moodle | <3.9.19 | 3.9.19 |
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Reference Links
- http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-76810
- https://bugzilla.redhat.com/show_bug.cgi?id=2162526
- https://moodle.org/mod/forum/discuss.php?d=443272#p1782021
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2165637
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2165638
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2023-23921.
What is the severity of CVE-2023-23921?
The severity of CVE-2023-23921 is high.
How does CVE-2023-23921 affect Moodle?
CVE-2023-23921 affects Moodle versions 3.9.0 to 3.9.19, 3.11.0 to 3.11.12, 4.0.0 to 4.0.6, and 4.1.0.
How can a remote attacker exploit CVE-2023-23921?
A remote attacker can trick a victim to follow a specially crafted link, allowing them to execute arbitrary HTML and script code in the user's browser within the context of the vulnerable Moodle website.
How can I fix CVE-2023-23921?
To fix CVE-2023-23921, update your Moodle installation to version 4.1.1, 4.0.6, 3.11.12, or 3.9.19.
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