CVE-2021-36398
Moodle Cross-site Scripting vulnerability
In moodle, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.
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, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.
- Record
CVE-2021-36398- 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
In moodle, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.
- Record
CVE-2021-36398- 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, CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2023-0918
In moodle, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.
- Record
EUVD-2023-0918- 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
GitHub AdvisoriesGHSA-786g-xv8v-9h93
Moodle Cross-site Scripting vulnerability
In Moodle, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.
- Record
GHSA-786g-xv8v-9h93- 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, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.
- Record
CVE-2021-36398- 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-786g-xv8v-9h93
Moodle Cross-site Scripting vulnerability
In Moodle, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.
- Record
GHSA-786g-xv8v-9h93- 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-2021-36398
In moodle, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.
- Record
UBUNTU-CVE-2021-36398- 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-2021-36398 No score
In moodle, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.
- Record
BIT-moodle-2021-36398- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
moodle/moodlePackagist |
3.11 to 3.11 | 3.11.1 |
moodleBitnami |
3.11.0 up to 3.11.1 | 3.11.1 |
moodle/moodlePackagist |
3.11 up to 3.11.1, plus listed versions v3.11.0v3.11.0-betav3.11.0-rc1v3.11.0-rc2 |
3.11.1 |
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 |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-36398 is a medium vulnerability (CVSS 5.4) in Moodle, published March 6, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.52%, the 44th percentile. Fixed in moodle/moodle 3.11.1.