Unrated severityOSV Advisory· Published Jan 21, 2026· Updated Mar 5, 2026

Moodle 3.10.3 - 'label' Persistent Cross Site Scripting

CVE-2021-47857

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Moodle/MoodleOSV2 versions
v1.0.0, v1.0.1, v1.0.2, …+ 1 more
- (no CPE)range: v1.0.0, v1.0.1, v1.0.2, …
- (no CPE)range: =3.10.3
osv-coords
pkg:bitnami/moodle
Range: >= 3.10.3, <= 3.10.3

Patches

Vulnerability mechanics

References

www.exploit-db.com/exploits/49714mitreexploit
www.vulncheck.com/advisories/moodle-label-persistent-cross-site-scriptingmitrethird-party-advisory
moodle.orgmitreproduct

News mentions

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