CVE-2020-1691 Moodle XSS Vulnerability
Attackers can inject malicious scripts into Moodle messages, potentially stealing user sessions or executing code in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-1691?
CVE-2020-1691 is a medium-severity cross-site scripting vulnerability in Moodle Moodle, published on 5 Aug 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
In Moodle 3.8, messages required extra sanitizing before updating the conversation overview, to prevent the risk of stored cross-site scripting.
Weakness: CWE-79
Which versions are affected by CVE-2020-1691?
3 open source packages ship an affected version, including moodle/moodle and moodle. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
moodle/moodle Packagist | From 3.8 | 3.8.1 |
moodle/moodle Packagist | From 3.8 | 3.8.1 |
moodle Bitnami | From 3.8.0 | 3.8.1 |
Products include Moodle Moodle.
How do I fix CVE-2020-1691?
Upgrade moodle/moodle to 3.8.1 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2020-1691 being exploited?
There is no known exploitation of CVE-2020-1691 in the wild and no public exploit code.
Other vulnerabilities in Moodle Moodle
- CVE-2006-4935 File upload in n/a
- CVE-2006-4936 Moodle does not properly validate module instance id
- CVE-2004-2233 Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors.
- CVE-2004-2235 Cross-site scripting in n/a
- CVE-2004-2236 Other in n/a
Sources
Also known as BIT-moodle-2020-1691, GHSA-cwhp-rqfr-8462, UBUNTU-CVE-2020-1691.