CVE-2021-43558
Cross-site Scripting in moodle
A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.
- Record
CVE-2021-43558- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE ListNo score
A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.
- Record
CVE-2021-43558- Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2021-2406No score
A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.
- Record
EUVD-2021-2406- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-wpfp-q843-v772
Cross-site Scripting in moodle
A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.
- Record
GHSA-wpfp-q843-v772- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.
- Record
CVE-2021-43558- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-wpfp-q843-v772
Cross-site Scripting in moodle
A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.
- Record
GHSA-wpfp-q843-v772- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-43558
A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.
- Record
UBUNTU-CVE-2021-43558- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVBIT-moodle-2021-43558No score
A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.
- Record
BIT-moodle-2021-43558- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
moodle/moodlePackagist | 3.11.0 up to 3.11.4 | 3.11.4 |
moodle/moodlePackagist | 3.10.0 up to 3.10.8 | 3.10.8 |
moodle/moodlePackagist | 3.9.0 up to 3.9.11 | 3.9.11 |
moodleBitnami | before 3.8.9, 3.9.0 up to 3.9.11, 3.10.0 up to 3.10.8, 3.11.0 up to 3.11.4 | 3.8.93.9.113.10.83.11.4 |
moodle/moodlePackagist | 3.11.0 up to 3.11.4, plus listed versions v3.11.0v3.11.1v3.11.2v3.11.3 | 3.11.4 |
moodle/moodlePackagist | 3.10.0 up to 3.10.8, plus listed versions v3.10.0v3.10.1v3.10.2v3.10.3v3.10.4v3.10.5v3.10.6v3.10.7 | 3.10.8 |
moodle/moodlePackagist | 3.9.0 up to 3.9.11, plus listed versions v3.9.0v3.9.1v3.9.10v3.9.2v3.9.3 Show 6 moreShow lessv3.9.4v3.9.5v3.9.6v3.9.7v3.9.8v3.9.9 | 3.9.11 |
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-2021-43558 is a medium vulnerability (CVSS 6.1) in Moodle, published November 22, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.87%, the 59th percentile. Fixed in moodle/moodle 3.11.4.