CVE-2023-5543

Original meeting access via reused meeting identifier

Published Nov 9, 2023 · Updated Aug 2, 2024

Access control failure in affected Moodle LMS 4.0, 4.1, and 4.2 releases allows attackers to access original BigBlueButton meetings. The activity duplication path copies the source activity's meeting identifier instead of assigning a fresh identifier to the duplicate. Exploitation requires a duplicated BigBlueButton activity and access to that duplicate; the consequence is unintended access to the original meeting.

CVSS severity3.3
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access control failure in affected Moodle LMS 4.0, 4.1, and 4.2 releases allows attackers to access original BigBlueButton meetings. The activity duplication path copies the source activity's meeting identifier instead of assigning a fresh identifier to the duplicate. Exploitation requires a duplicated BigBlueButton activity and access to that duplicate; the consequence is unintended access to the original meeting.

The record

CVE
CVE-2023-5543
Published
Nov 9, 2023
Updated
Aug 2, 2024
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-284
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 9, 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=4.0.0 <4.0.11
  2. Affected versionversion=4.1.0 <4.1.6
  3. Affected versionversion=4.2.0 <4.2.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Moodle · Moodle LMSversion=4.0.0 <4.0.11; version=4.1.0 <4.1.6; version=4.2.0 <4.2.3

Published CVSS scores

3.3NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.3Fedora ProjectCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

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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