VULNERABILITY INTELLIGENCE

CVE-2021-47857

CVSS score7.2 HIGH

EPSS probability0.38%

CISA KEVNot currently listed

Published2026-01-21

Last modified2026-06-17

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

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.

Weakness classification

disclosure@vulncheck.com: CWE-79

Primary references

disclosure@vulncheck.com — Product
disclosure@vulncheck.com — Exploit, Third Party Advisory, VDB Entry
disclosure@vulncheck.com — Third Party Advisory