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CVE-2021-47857

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Date: January 21, 2026

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.

Severity Score

Related Resources (5)

https://moodle.org/
https://www.exploit-db.com/exploits/49714
https://www.vulncheck.com/advisories/moodle-label-persistent-cross-site-scripting
https://nvd.nist.gov/vuln/detail/CVE-2021-47857
https://www.mend.io/vulnerability-database/CVE-2021-47857

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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