CVE-2023-5546

Moodle: stored xss in quiz grading report via user id number

4.3 MediumPublic exploitFix available

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored 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: None
Availability: None

Exploit likelihood

1.31%Up 1.3 points since Nov 10, 2023

What each source reports

CVE List Score used 4.3

Moodle: stored xss in quiz grading report via user id number

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

Record: CVE-2023-5546
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2023-2935 4.3

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

Record: EUVD-2023-2935
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-9724-h8p7-r3jv 5.4

Moodle Cross-site Scripting vulnerability

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

Record: GHSA-9724-h8p7-r3jv
CVSS 3.1: 5.4 MediumCVSS: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

NVD 4.3

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

Record: CVE-2023-5546
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS 3.1: 5.4 MediumCVSS: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 4.3

Moodle: stored xss in quiz grading report via user id number

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

Record: CVE-2023-5546
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSVGHSA-9724-h8p7-r3jv 5.4

Moodle Cross-site Scripting vulnerability

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

Record: GHSA-9724-h8p7-r3jv
CVSS 3.1: 5.4 MediumCVSS: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-2023-5546 4.3

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

Record: UBUNTU-CVE-2023-5546
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVBIT-moodle-2023-5546 No score

Moodle: stored xss in quiz grading report via user id number

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

Record: BIT-moodle-2023-5546
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	4.0.0 up to 4.0.11, 4.1.0 up to 4.1.6, 4.2.0 up to 4.2.3	4.0.114.1.64.2.3
`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

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	obelia01/CVE-2023-5546	2023-08-21

History

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

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

In short

CVE-2023-5546 is a medium vulnerability (CVSS 4.3) in Moodle, published November 9, 2023. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.31%, the 70th 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.