What is CVE-2023-5546?

CVE-2023-5546 is a medium-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2023-11-09.

How severe is CVE-2023-5546?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Is CVE-2023-5546 known to be exploited?

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

XSS in Moodle

CVE-2023-5546

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

Vulnerability class: XSS (Cross-Site Scripting)

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

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (66.1th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

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

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

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

Frequently asked questions

What is CVE-2023-5546?: CVE-2023-5546 is a medium-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2023-11-09.
How severe is CVE-2023-5546?: Medium severity. CVSS v3 base score is 4.3 out of 10.
Is CVE-2023-5546 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.