CVE-2021-47857
Moodle 3.10.3 - 'label' Persistent Cross Site Scripting
- State
- Published
- Severity
- 5.1 Medium
- Published
- Jan 21, 2026
- Updated
- Mar 5, 2026
- Reserved
- Jan 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | 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 | VulnCheck |
| 3.1 | 7.2 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
MoodleMoodle |
|
References
- ExploitDB-49714exploit
- Official Moodle Project Homepageproduct
- VulnCheck Advisory: Moodle 3.10.3 - 'label' Persistent Cross Site Scriptingthird-party-advisory
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