CVE-2021-47857

State: PUBLISHED · Published: 2026-01-21 · Updated: 2026-03-05 · Assigner: VulnCheck

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.

CWE

CWE-79 — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected

Moodle / Moodle — v=3.10.3 [affected]

CVSS

4.0 score=5.1 severity=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
3.1 score=7.2 severity=HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

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

Source

cvelistV5-main/cves/2021/47xxx/CVE-2021-47857.json