Moodle Cross-site Scripting

published 2018-05-25 8 y ago modified 2026-06-17 4 mo ago also GHSA-xhfw-wjjc-4j5h , EUVD-2022-5797

cvss: 4.3; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

An issue was discovered in Moodle 3.x. An authenticated user is allowed to add HTML blocks containing scripts to their Dashboard; this is normally not a security issue because a personal dashboard is visible to this user only. Through this security vulnerability, users can move such a block to other pages where they can be viewed by other users.

Patch / fix

fixed in 1

packagist moodle/moodle 3.1.12, 3.2.9, 3.3.6, 3.4.3

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-2018-1136 updated 2026-01-09

moodle: Six security issues fixed in the latest release

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

1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	4.3	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	4.0	AV:N/AC:L/Au:S/C:P/I:N/A:N
GitHub	3.0	4.3	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	moodle/moodle	>=3.1, <3.1.12 >=3.2, <3.2.9 >=3.3, <3.3.6 >=3.4, <3.4.3	3.1.12 3.2.9 3.3.6 3.4.3

Affected products

n/a Moodle 3.x unknown

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

moodle.org /mod/forum/discuss.php?d=371202
web, vendor-advisory
securityfocus.com /bid/104307
vdb-entry, web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2018-1136
advisory
github.com /moodle/moodle
package

Sources

CVE List CVE-2018-1136
GitHub Advisory GHSA-xhfw-wjjc-4j5h
NVD CVE-2018-1136

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