What is CVE-2023-5544?

CVE-2023-5544 is a medium-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2023-11-09.

How severe is CVE-2023-5544?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2023-5544 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Moodle

CVE-2023-5544

Wiki comments required additional sanitizing and access restrictions to prevent a stored XSS risk and potential IDOR risk.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-11-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (41.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Moodle
Fedoraproject Fedora — versions 37, 38, 39
Red Hat Enterprise Linux — versions 7.0

Weakness classification (CWE)

Public proof-of-concept exploits

jev770/badmoodle-scan

References

git.moodle.org/gw (Patch)
bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking)
moodle.org/mod/forum/discuss.php (Patch, Mailing List)

Frequently asked questions

What is CVE-2023-5544?: CVE-2023-5544 is a medium-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2023-11-09.
How severe is CVE-2023-5544?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2023-5544 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.