Moodle calculated question type allows remote code execution by Question authors

published 2018-05-25 8 y ago modified 2026-06-17 4 mo ago also GHSA-xh2j-q4mc-v522 , EUVD-2022-5790

cvss: 8.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 30.8%; EPSS 30.8% chance of exploitation in 30 days, percentile 98%
public exploits: 1; Exploit-DB

An issue was discovered in Moodle 3.x. A Teacher creating a Calculated question can intentionally cause remote code execution on the server, aka eval injection.

Patch / fix

fixed in 1 links 1

packagist moodle/moodle 3.1.12, 3.2.9, 3.3.6, 3.4.3

moodle.org/mod/forum/discuss.php?d=371199 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-2018-1133 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

Timeline

2018-05-25 Published
2019-03-15 First public exploit (EDB-46551)

Exploit prediction

30.81% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-46551 Moodle 3.4.1 - Remote Code Execution webapps, 2019-03-15

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.5	AV:N/AC:L/Au:S/C:P/I:P/A:P
GitHub	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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-94 Improper Control of Generation of Code

References

moodle.org /mod/forum/discuss.php?d=371199
web, patch, vendor-advisory
exploit-db.com /exploits/46551/
exploit, third-party-advisory, vdb-entry
securityfocus.com /bid/104307
vdb-entry, web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2018-1133
advisory
github.com /moodle/moodle
package
exploit-db.com /exploits/46551
web

Sources

CVE List CVE-2018-1133
GitHub Advisory GHSA-xh2j-q4mc-v522
NVD CVE-2018-1133

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