CVE-2021-47857

HIGH
2026-01-21 [email protected]
7.2
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Mar 05, 2026 - 19:45 vuln.today
Public exploit code
CVE Published
Jan 21, 2026 - 18:16 nvd
HIGH 7.2

Tags

Moodle XSS

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.

Analysis

Moodle 3.10.3 contains a persistent cross-site scripting vulnerability in the calendar event subtitle field that allows attackers to inject malicious scripts. [CVSS 7.2 HIGH]

Technical Context

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Moodle. 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.

Affected Products

Vendor: Moodle. Product: Moodle. Versions: up to 3.10.3.

Remediation

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

Priority Score

56
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +36
POC: +20

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CVE-2021-47857 vulnerability details – vuln.today
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