Which products and versions are affected by CVE-2018-1133?

Affected: Moodle; moodle/moodle (composer) versions >= 3.4; Moodle 3.x unknown versions >= Moodle 3.x unknown. The full list is in the CVE brief.

Is CVE-2018-1133 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2018-1133 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2018-1133?

Public exploit code is available.

Is there a fix for CVE-2018-1133?

Fixed versions are available, including Moodle <=3.1.11, moodle/moodle 3.1.12, moodle/moodle 3.2.9.

How urgently should CVE-2018-1133 be patched?

Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Request A Demo

WatchlistHigh

CVE-2018-1133Moodle Code Injection

Q: What is CVE-2018-1133?

An issue was discovered in Moodle 3.x.

Q: How urgently should CVE-2018-1133 be patched?

Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Moodle calculated question type allows remote code execution by Question authors

Published May 13, 2022 · Updated Jul 8, 2026 · Also known as GHSA-xh2j-q4mc-v522, UBUNTU-CVE-2018-1133

Key Facts

Patch immediately

CVE-2018-1133 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Moodle, moodle/moodle (composer), Moodle 3.x unknown.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 31% probability of exploitation in the next 30 days.
Fixed versions are available, including Moodle <=3.1.11, moodle/moodle 3.1.12, moodle/moodle 3.2.9.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Scores

CVSS v3.1

8.8

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

31%

Higher than 98.2% of all scored CVEs

Exploit maturity

Proof of concept

ATLAS score

47/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Not listed

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Proof of concept

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Advisories And Exploit References

advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2018-1133
advisoryhttps://ubuntu.com/security/CVE-2018-1133
advisoryhttps://www.cve.org/CVERecord?id=CVE-2018-1133
advisoryGHSA advisory
advisory104307
patchhttps://moodle.org/mod/forum/discuss.php?d=371199

Description

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.

Affected Products

5 affected entries in total

Product	Affected versions	Fixed in
MoodleMoodle	See advisory	3.1.11
moodle/moodlecomposer	>= 3.4	3.4.3
Moodle 3.x unknown	>= Moodle 3.x unknown	n/a

Patched Releases

Moodle

<=3.1.11

moodle/moodle

3.1.12, 3.2.9, 3.3.6, 3.4.3

Timeline

Publicly disclosed
May 13, 2022
Last updated
Jul 8, 2026

Weakness Type

CWE-94 Improper Control of Generation of Code ('Code Injection')

References

4 more references in the full CVE brief

FAQ

Common Questions.

An issue was discovered in Moodle 3.x.
Affected: Moodle; moodle/moodle (composer) versions >= 3.4; Moodle 3.x unknown versions >= Moodle 3.x unknown. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Moodle <=3.1.11, moodle/moodle 3.1.12, moodle/moodle 3.2.9.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Is CVE-2018-1133 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.

Request A Demo