Moodle 3.10.3 contains a persistent cross-site scripting vulnerability in the calendar event subtitle field that allows attackers to inject malicious scripts. Attackers can craft a calendar event with malicious JavaScript in the subtitle track label to execute arbitrary code when users view the event.
History

Fri, 23 Jan 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Moodle
Moodle moodle
Vendors & Products Moodle
Moodle moodle

Thu, 22 Jan 2026 23:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 21 Jan 2026 17:45:00 +0000

Type Values Removed Values Added
Description Moodle 3.10.3 contains a persistent cross-site scripting vulnerability in the calendar event subtitle field that allows attackers to inject malicious scripts. Attackers can craft a calendar event with malicious JavaScript in the subtitle track label to execute arbitrary code when users view the event.
Title Moodle 3.10.3 - 'label' Persistent Cross Site Scripting
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-01-21T17:27:39.382Z

Updated: 2026-01-22T22:09:37.406Z

Reserved: 2026-01-14T17:11:19.904Z

Link: CVE-2021-47857

cve-icon Vulnrichment

Updated: 2026-01-22T22:09:32.126Z

cve-icon NVD

Status : Received

Published: 2026-01-21T18:16:16.567

Modified: 2026-01-21T18:16:16.567

Link: CVE-2021-47857

cve-icon Redhat

No data.