Moodle: duplicating a bigbluebutton activity assigns the same meeting id

published 2023-11-09 2 y ago modified 2026-09-08 2 mo ago also BIT-moodle-2023-5543 , EUVD-2023-57851

cvss: 3.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 16%
public exploits: 0; none known

When duplicating a BigBlueButton activity, the original meeting ID was also duplicated instead of using a new ID for the new activity. This could provide unintended access to the original meeting.

Patch / fix

fixed in 2 links 3

bitnami moodle 4.0.11, 4.1.6, 4.2.3
moodle moodle 4.0.11, 4.1.6, 4.2.3

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-5543 updated 2025-11-21 cvss 3.3

moodle: Duplicating a BigBlueButton activity assigns the same meeting ID

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-07-16)

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
NVD	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
OSV	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	moodle	>=4.0.0, <4.0.11 >=4.1.0, <4.1.6 >=4.2.0, <4.2.3	4.0.11 4.1.6 4.2.3

Classification

Weakness

CWE-284 Improper Access Control

References

git.moodle.org /gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-77795
patch
bugzilla.redhat.com /show_bug.cgi?id=2243442
issue-tracking, patch, third-party-advisory, advisory
moodle.org /mod/forum/discuss.php?d=451584
patch, vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2023-5543
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary