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Vulnerabilities ›

CVE-2021-47857

High

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

CWE-79 — Weakness Type

                    Published: Jan 21, 2026                      ·  Modified: Feb 28, 2026                      ·  Source: NVD                

CVSS v3

7.2

🔗 NVD Official

📄 Description (English)

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.

🤖

Queued for AI Analysis

This CVE will be auto-analyzed on the next cron run.

🔗 References & Sources 3

https://moodle.org/

disclosure@vulncheck.com

https://www.exploit-db.com/exploits/49714

disclosure@vulncheck.com

https://www.vulncheck.com/advisories/moodle-label-persistent-cross-site-scripting

disclosure@vulncheck.com

📊 CVSS Score

7.2

/ 10.0 — High

📊 CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack VectorN — None / Network

Attack ComplexityL — Low / Local

Privileges RequiredN — None / Network

User InteractionN — None / Network

ScopeC — Changed

ConfidentialityL — Low / Local

IntegrityL — Low / Local

AvailabilityN — None / Network

📋 Quick Facts

Severity High

CVSS Score7.2

CWECWE-79

EPSS0.05%

Exploit No

Patch ✓ Yes

Published 2026-01-21

Source Feed nvd

Views 1

🏷️ Tags

CWE-79

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🔗 NVD Official Page ⚡ Exploit-DB Search 🐙 GitHub PoC Search 🎯 MITRE ATT&CK 📊 CVE Details

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