CVE-2022-40208Network attack vector

Quiz order bypass via unchecked web-service responses

Published Mar 24, 2023 · Updated Feb 20, 2025

Improper authorization in Moodle LMS allows remote authenticated users to bypass sequential navigation during a quiz attempt. The mod_quiz web-service response builder appends question data without calling quiz_attempt::check_page_access, so later pages are returned regardless of the attempt's current page. Exploitation requires student access to an in-progress quiz configured for sequential navigation and permits viewing questions ahead of the enforced order.

CVSS severity4.3
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Moodle LMS allows remote authenticated users to bypass sequential navigation during a quiz attempt. The mod_quiz web-service response builder appends question data without calling quiz_attempt::check_page_access, so later pages are returned regardless of the attempt's current page. Exploitation requires student access to an in-progress quiz configured for sequential navigation and permits viewing questions ahead of the enforced order.

The record

CVE
CVE-2022-40208
Published
Mar 24, 2023
Updated
Feb 20, 2025
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-285
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=affected 4.0 to 4.0.2, 3.11 to 3.11.8, 3.9 to 3.9.15 and earlier unsupported versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Moodle · Moodle LMSversion=affected 4.0 to 4.0.2, 3.11 to 3.11.8, 3.9 to 3.9.15 and earlier unsupported versions

Published CVSS scores

4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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