CVE-2021-40694
Moodle Improper Encoding or Escaping of Output
Insufficient escaping of the LaTeX preamble made it possible for site administrators to read files available to the HTTP server system account.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
Insufficient escaping of the LaTeX preamble made it possible for site administrators to read files available to the HTTP server system account.
- Record
CVE-2021-40694- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-116
- Updated
- 2026-11-02
CVE List No score
Insufficient escaping of the LaTeX preamble made it possible for site administrators to read files available to the HTTP server system account.
- Record
CVE-2021-40694- Updated
- 2026-11-02
EUVDEUVD-2022-6866 No score
Insufficient escaping of the LaTeX preamble made it possible for site administrators to read files available to the HTTP server system account.
- Record
EUVD-2022-6866- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-m37g-mwcg-7j7v
Moodle Improper Encoding or Escaping of Output
Insufficient escaping of the LaTeX preamble made it possible for site administrators to read files available to the HTTP server system account.
- Record
GHSA-m37g-mwcg-7j7v- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-116
- Updated
- 2026-11-02
OSV
Insufficient escaping of the LaTeX preamble made it possible for site administrators to read files available to the HTTP server system account.
- Record
CVE-2021-40694- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-m37g-mwcg-7j7v
Moodle Improper Encoding or Escaping of Output
Insufficient escaping of the LaTeX preamble made it possible for site administrators to read files available to the HTTP server system account.
- Record
GHSA-m37g-mwcg-7j7v- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-116
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-40694
Insufficient escaping of the LaTeX preamble made it possible for site administrators to read files available to the HTTP server system account.
- Record
UBUNTU-CVE-2021-40694- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVBIT-moodle-2021-40694 No score
Insufficient escaping of the LaTeX preamble made it possible for site administrators to read files available to the HTTP server system account.
- Record
BIT-moodle-2021-40694- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
moodle/moodlePackagist |
3.9 up to 3.9.10 | 3.9.10 |
moodle/moodlePackagist |
3.10 up to 3.10.7 | 3.10.7 |
moodle/moodlePackagist |
3.11 up to 3.11.3 | 3.11.3 |
moodleBitnami |
before 3.9.10, 3.10.0 up to 3.10.7, 3.11.0 up to 3.11.3 | 3.9.103.10.73.11.3 |
moodle/moodlePackagist |
3.9 up to 3.9.10, plus listed versions v3.9.0v3.9.0-betav3.9.0-rc1v3.9.0-rc2v3.9.0-rc3 Show 9 moreShow lessv3.9.1v3.9.2v3.9.3v3.9.4v3.9.5v3.9.6v3.9.7v3.9.8v3.9.9 |
3.9.10 |
moodle/moodlePackagist |
3.10 up to 3.10.7, plus listed versions v3.10.0v3.10.0-betav3.10.0-rc1v3.10.0-rc2v3.10.1 Show 5 moreShow lessv3.10.2v3.10.3v3.10.4v3.10.5v3.10.6 |
3.10.7 |
moodle/moodlePackagist |
3.11 up to 3.11.3, plus listed versions v3.11.0v3.11.0-betav3.11.0-rc1v3.11.0-rc2v3.11.1v3.11.2 |
3.11.3 |
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-2021-40694 is a medium vulnerability (CVSS 4.9) in Moodle, published January 21, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.90%, the 59th percentile. Fixed in moodle/moodle 3.9.10.