CVE-2021-47857

5.1 mediumEPSS 0.4%

Medium (5.1) in moodle moodle. EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

5.1 medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

CVSS 3.1

6.1 medium

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-01-21
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

moodle:moodle

References

https://moodle.org/
https://www.exploit-db.com/exploits/49714
https://www.vulncheck.com/advisories/moodle-label-persistent-cross-site-scripting

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