Bug 2431706 (CVE-2021-47857) - CVE-2021-47857 moodle: Moodle: Arbitrary code execution via persistent cross-site scripting in calendar event subtitle
Summary: CVE-2021-47857 moodle: Moodle: Arbitrary code execution via persistent cross-...
Keywords:
Status: NEW
Alias: CVE-2021-47857
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-21 18:04 UTC by OSIDB Bzimport
Modified: 2026-01-21 19:00 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-01-21 18:04:08 UTC 
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.
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