Moodle Cross-site Scripting

published 2018-09-17 8 y ago modified 2026-06-17 4 mo ago also GHSA-gqrp-qhv8-phrv , EUVD-2022-3997

cvss: 8.8; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.1%; EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits: 0; none known

moodle before versions 3.5.2, 3.4.5, 3.3.8 is vulnerable to a boost theme - blog search GET parameter insufficiently filtered. The breadcrumb navigation provided by Boost theme when displaying search results of a blog were insufficiently filtered, which could result in reflected XSS if a user followed a malicious link containing JavaScript in the search parameter.

Patch / fix

fixed in 2 links 3

packagist moodle/moodle 3.3.8, 3.4.5, 3.5.2
moodle moodle 3.3.8, 3.4.5, 3.5.2

moodle.org/mod/forum/discuss.php?d=376025 advisory
git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-62857 advisory
bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14631 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-14631 updated 2026-01-09 cvss 8.8

moodle: boost theme - blog search GET parameter insufficiently filtered (MSA-18-0019)

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.08% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	3.0	6.1	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub	3.0	6.1	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	moodle/moodle	>=3.3, <3.3.8 >=3.4, <3.4.5 >=3.5, <3.5.2	3.3.8 3.4.5 3.5.2

Affected products

[UNKNOWN] moodle

Classification

Weakness

CWE-20 Improper Input Validation
CWE-79 Improper Neutralization of Input During Web Page Generation

References

moodle.org /mod/forum/discuss.php?d=376025
web, patch, vendor-advisory
git.moodle.org /gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-62857
web, patch, vendor-advisory
bugzilla.redhat.com /show_bug.cgi?id=CVE-2018-14631
web, issue-tracking, patch, third-party-advisory
securityfocus.com /bid/105371
vdb-entry, web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2018-14631
advisory
github.com /moodle/moodle
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary