CVE-2021-47857

HIGH

7.2

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.

CVE Details

CVSS v3.1 Score7.2

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published1/21/2026

Last Modified3/5/2026

Sourcenvd

Honeypot Sightings0

Affected Products

moodle:moodle

Weaknesses (CWE)

CWE-79

References

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)

IOC Correlations

No correlations recorded

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