CVE-2018-1133

Exp

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.

Published: 2018-05-25 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-1133 is rated High Exploit Risk (79.3/100): CVSS High severity, with high exploitation likelihood (EPSS 40.78%, 97th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2018-1133

EDB-ID Source Kind Published Link
46551 exploit_db edb 2019-03-15 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2018-1133

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-31 54.03% 40.78% -13.25%
2 2026-05-13 61.68% 54.03% -7.65%
3 2026-05-04 — 61.68% —

Full EPSS history (37 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-1133

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
6.5 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.0 6.4 [email protected]

Weakness enumeration for CVE-2018-1133

GitHub Security Advisory for CVE-2018-1133

GHSA-xh2j-q4mc-v522 · Severity: high · Ecosystem: composer — Moodle calculated question type allows remote code execution by Question authors

OS Trackers for CVE-2018-1133

vendor priority summary link
ubuntu medium CVE-2018-1133 medium priority: Ubuntu including 1 source packages (moodle), 20 status rows across 20 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 13, ignored 4, needs-triage 3. https://ubuntu.com/security/CVE-2018-1133

Affected software / configurations for CVE-2018-1133

Vendor Product Version Raw CPE
moodle moodle >= 3.1.0, <= 3.1.11 cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle >= 3.2.0, <= 3.2.8 cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle >= 3.3.0, <= 3.3.5 cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle >= 3.4.0, <= 3.4.2 cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*

References for CVE-2018-1133

URL Tags
http://www.securityfocus.com/bid/104307 Third Party Advisory VDB Entry
https://moodle.org/mod/forum/discuss.php?d=371199 Patch Vendor Advisory
https://www.exploit-db.com/exploits/46551/ Exploit Third Party Advisory VDB Entry
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