CVE-2020-1691
Moodle XSS Vulnerability
In Moodle 3.8, messages required extra sanitizing before updating the conversation overview, to prevent the risk of stored cross-site scripting.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
In Moodle 3.8, messages required extra sanitizing before updating the conversation overview, to prevent the risk of stored cross-site scripting.
- Record
CVE-2020-1691- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
In Moodle 3.8, messages required extra sanitizing before updating the conversation overview, to prevent the risk of stored cross-site scripting.
- Record
CVE-2020-1691- Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2022-6545 No score
In Moodle 3.8, messages required extra sanitizing before updating the conversation overview, to prevent the risk of stored cross-site scripting.
- Record
EUVD-2022-6545- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-cwhp-rqfr-8462
Moodle XSS Vulnerability
In Moodle 3.8, messages required extra sanitizing before updating the conversation overview, to prevent the risk of stored cross-site scripting.
- Record
GHSA-cwhp-rqfr-8462- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
In Moodle 3.8, messages required extra sanitizing before updating the conversation overview, to prevent the risk of stored cross-site scripting.
- Record
CVE-2020-1691- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-cwhp-rqfr-8462
Moodle XSS Vulnerability
In Moodle 3.8, messages required extra sanitizing before updating the conversation overview, to prevent the risk of stored cross-site scripting.
- Record
GHSA-cwhp-rqfr-8462- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2020-1691
In Moodle 3.8, messages required extra sanitizing before updating the conversation overview, to prevent the risk of stored cross-site scripting.
- Record
UBUNTU-CVE-2020-1691- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVBIT-moodle-2020-1691 No score
In Moodle 3.8, messages required extra sanitizing before updating the conversation overview, to prevent the risk of stored cross-site scripting.
- Record
BIT-moodle-2020-1691- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
moodle/moodlePackagist |
3.8 to 3.8 | 3.8.1 |
moodleBitnami |
3.8.0 up to 3.8.1 | 3.8.1 |
moodle/moodlePackagist |
3.8 up to 3.8.1, plus listed versions v3.8.0v3.8.0-betav3.8.0-rc1 |
3.8.1 |
moodleUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 2.7.9+dfsg-12.7.10+dfsg-12.7.11+dfsg-12.7.11+dfsg-22.7.12+dfsg-13.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1 |
None known |
moodleUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 3.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-1691 is a medium vulnerability (CVSS 5.4) in Moodle, published August 5, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.65%, the 51st percentile. Fixed in moodle/moodle 3.8.1.