CVE-2011-4278

Moodle XSS In Tag Autocomplete functionality

4.3 MediumFix available

Cross-site scripting (XSS) vulnerability in the tag autocomplete functionality in Moodle 1.9.x before 1.9.11 and 2.0.x before 2.0.2 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Exploit likelihood

1.83%Up 0.7 points since Feb 4, 2022

What each source reports

NVD Score used 4.3

Record: CVE-2011-4278
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

Record: CVE-2011-4278
Updated: 2026-11-02

EUVDEUVD-2022-2723 No score

Record: EUVD-2022-2723
Updated: 2026-11-03

GitHub AdvisoriesGHSA-6656-6qwx-4c2m No score

Moodle XSS In Tag Autocomplete functionality

Record: GHSA-6656-6qwx-4c2m
Weakness: CWE-79
Updated: 2026-11-02

OSVGHSA-6656-6qwx-4c2m No score

Moodle XSS In Tag Autocomplete functionality

Record: GHSA-6656-6qwx-4c2m
Weakness: CWE-79
Updated: 2026-11-02

Affected products

moodle

Affected packages

Affected packages
Package	Affected	Fixed
`moodle/moodle` Packagist	2.0 up to 2.0.2	2.0.2
`moodle/moodle` Packagist	before 1.9.11	1.9.11
`moodle` Debian:6.0 From an advisory covering 6 CVEs	before 1.9.9.dfsg2-2.1+squeeze1, plus listed versions 1.9.9.dfsg2-2.1	1.9.9.dfsg2-2.1+squeeze1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
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-2011-4278 is a medium vulnerability (CVSS 4.3) in Moodle, published June 16, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.83%, the 79th percentile. Fixed in moodle/moodle 2.0.2.