CVE-2023-5543 — When duplicating a BigBlueButton activity, the original meeting ID was also dupl

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
?	?	4.2.0, 4.1.0, 4.0.0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-11-09T21:35:38.116Z
• Last modified: 2024-08-02T07:59:44.863Z

09References

• git.moodle.org — http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-77795
• bugzilla.redhat.com — https://bugzilla.redhat.com/show_bug.cgi?id=2243442
• moodle.org — https://moodle.org/mod/forum/discuss.php?d=451584