CVE-2023-5539

Moodle: authenticated remote code execution risk in lesson

4.7 MediumFix available

A remote code execution risk was identified in the Lesson activity. By default this was only available to teachers and managers.

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: Low
Integrity: Low
Availability: Low

Exploit likelihood

2.19%Up 2.1 points since Nov 10, 2023

What each source reports

CVE List Score used 4.7

Moodle: authenticated remote code execution risk in lesson

A remote code execution risk was identified in the Lesson activity. By default this was only available to teachers and managers.

Record: CVE-2023-5539
CVSS 3.1: 4.7 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-94
Updated: 2026-11-02

EUVDEUVD-2023-2868 4.7

A remote code execution risk was identified in the Lesson activity. By default this was only available to teachers and managers.

Record: EUVD-2023-2868
CVSS 3.1: 4.7 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Updated: 2026-11-03

GitHub AdvisoriesGHSA-3xxm-3g3c-w579 4.7

Moodle Code Injection vulnerability

A remote code execution risk was identified in the Lesson activity. By default this was only available to teachers and managers.

Record: GHSA-3xxm-3g3c-w579
CVSS 3.1: 4.7 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-94
Updated: 2026-11-02

NVD 4.7

A remote code execution risk was identified in the Lesson activity. By default this was only available to teachers and managers.

Record: CVE-2023-5539
CVSS 3.1: 4.7 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-94
Updated: 2026-11-02

OSV 4.7

Moodle: authenticated remote code execution risk in lesson

A remote code execution risk was identified in the Lesson activity. By default this was only available to teachers and managers.

Record: CVE-2023-5539
CVSS 3.1: 4.7 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-94
Updated: 2026-11-02

OSVGHSA-3xxm-3g3c-w579 4.7

Moodle Code Injection vulnerability

A remote code execution risk was identified in the Lesson activity. By default this was only available to teachers and managers.

Record: GHSA-3xxm-3g3c-w579
CVSS 3.1: 4.7 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-94
Updated: 2026-11-02

OSVUBUNTU-CVE-2023-5539 4.7

A remote code execution risk was identified in the Lesson activity. By default this was only available to teachers and managers.

Record: UBUNTU-CVE-2023-5539
CVSS 3.1: 4.7 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVBIT-moodle-2023-5539 No score

Moodle: authenticated remote code execution risk in lesson

A remote code execution risk was identified in the Lesson activity. By default this was only available to teachers and managers.

Record: BIT-moodle-2023-5539
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`moodle/moodle` Packagist	before 4.3.0-rc2	4.3.0-rc2
`moodle` Bitnami	before 3.9.24, 3.11.0 up to 3.11.17, 4.0.0 up to 4.0.11, 4.1.0 up to 4.1.6, 4.2.0 up to 4.2.3	3.9.243.11.174.0.114.1.64.2.3
`moodle/moodle` Packagist	before 4.3.0-rc2, plus listed versions v2.3.10v2.3.11v2.3.4v2.3.5v2.3.6 Show 45 moreShow less v2.3.7v2.3.8v2.3.9v2.4.0v2.4.0-rc1v2.4.1v2.4.10v2.4.11v2.4.2v2.4.3v2.4.4v2.4.5v2.4.6v2.4.7v2.4.8v2.4.9v2.5.0v2.5.0-betav2.5.0-rc1v2.5.1v2.5.2v2.5.3v2.5.4v2.5.5v2.5.6v2.5.7v2.5.8v2.5.9v2.6.0v2.6.0-betav2.6.0-rc1v2.6.1v2.6.10v2.6.11v2.6.2v2.6.3v2.6.4v2.6.5v2.6.6v2.6.7v2.6.8v2.6.9v2.7.0v2.7.0-betav2.7.0-rc1	4.3.0-rc2
`moodle` Ubuntu: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
`moodle` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 3.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-5539 is a medium vulnerability (CVSS 4.7) in Moodle, published November 9, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.19%, the 82nd percentile. Fixed in moodle/moodle 4.3.0-rc2.

References

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This page doesn't list everything

Left out here: 322 versions. The JSON record has them.