CVE-2023-28334Network attack vector

Name disclosure via premature page heading assignment

Published Mar 23, 2023 · Updated Aug 2, 2024

IDOR in Moodle LMS 4.0 through 4.0.6 and 4.1 through 4.1.1 allows remote authenticated users to enumerate other users' names. The setup_for_plan and setup_for_user_evidence methods resolve a supplied user ID and pass fullname($user) into the page heading, exposing the name in the response. Any authenticated account can vary the learning-plan user identifier and disclose valid display names, without gaining write access or service control.

CVSS severity4.3
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

IDOR in Moodle LMS 4.0 through 4.0.6 and 4.1 through 4.1.1 allows remote authenticated users to enumerate other users' names. The setup_for_plan and setup_for_user_evidence methods resolve a supplied user ID and pass fullname($user) into the page heading, exposing the name in the response. Any authenticated account can vary the learning-plan user identifier and disclose valid display names, without gaining write access or service control.

The record

CVE
CVE-2023-28334
Published
Mar 23, 2023
Updated
Aug 2, 2024
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-200, CWE-639, T1087
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <4.0.7
  2. Affected versionversion=4.0.0 <4.0.7
  3. Affected versionversion=4.1.0 <4.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Moodle · Moodle LMSversion=0 <4.0.7; version=4.0.0 <4.0.7; version=4.1.0 <4.1.2

Published CVSS scores

4.3CISACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-639Authorization Bypass Through User-Controlled Key
T1087Account Discovery

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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