CVE-2017-12156

Moodle XSS Vulnerability

6.1 MediumFix available

Moodle 3.x has XSS in the contact form on the "non-respondents" page in non-anonymous feedback.

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

1.23%Up 0.6 points since Apr 14, 2021

What each source reports

NVD Score used 6.1

Moodle 3.x has XSS in the contact form on the "non-respondents" page in non-anonymous feedback.

Record: CVE-2017-12156
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Moodle 3.x has XSS in the contact form on the "non-respondents" page in non-anonymous feedback.

Record: CVE-2017-12156
Updated: 2026-11-02

EUVDEUVD-2022-3034 No score

Moodle 3.x has XSS in the contact form on the "non-respondents" page in non-anonymous feedback.

Record: EUVD-2022-3034
Updated: 2026-11-03

GitHub AdvisoriesGHSA-7mfw-g8x4-rq2w 6.1

Moodle XSS Vulnerability

Moodle 3.x has XSS in the contact form on the "non-respondents" page in non-anonymous feedback.

Record: GHSA-7mfw-g8x4-rq2w
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 6.1

Moodle 3.x has XSS in the contact form on the "non-respondents" page in non-anonymous feedback.

Record: CVE-2017-12156
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVGHSA-7mfw-g8x4-rq2w 6.1

Moodle XSS Vulnerability

Moodle 3.x has XSS in the contact form on the "non-respondents" page in non-anonymous feedback.

Record: GHSA-7mfw-g8x4-rq2w
CVSS 3.0: 6.1 MediumCVSS:3.0/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-2017-12156 6.1

Moodle 3.x has XSS in the contact form on the "non-respondents" page in non-anonymous feedback.

Record: UBUNTU-CVE-2017-12156
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

Affected products

moodle

Affected packages

Affected packages
Package	Affected	Fixed
`moodle/moodle` Packagist	3.3.0 to 3.3.1	3.3.2
`moodle/moodle` Packagist	3.2.0 to 3.2.4	3.2.5
`moodle/moodle` Packagist	through 3.1.7	3.1.8
`moodle/moodle` Packagist	3.3.0 up to 3.3.2, plus listed versions v3.3.0v3.3.1	3.3.2
`moodle/moodle` Packagist	3.2.0 up to 3.2.5, plus listed versions v3.2.0v3.2.1v3.2.2v3.2.3v3.2.4	3.2.5
`moodle/moodle` Packagist	before 3.1.8, 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	3.1.8
`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	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-2017-12156 is a medium vulnerability (CVSS 6.1) in Moodle, published September 18, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.23%, the 69th percentile. Fixed in moodle/moodle 3.3.2.

References

This page doesn't list everything

Left out here: 77 versions. The JSON record has them.