CVE-2021-47857
HIGHMoodle 3.10.3 - XSS
Title source: llmDescription
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.
Exploits (1)
Scores
CVSS v3
7.2
EPSS
0.0004
EPSS Percentile
11.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (1)
moodle/moodle
3.10.3
Published
Jan 21, 2026
Tracked Since
Feb 18, 2026