CVE-2023-33176 — BigBlueButton is an open source virtual classroom designed to help teachers teac

BigBlueButton is an open source virtual classroom designed to help teachers teach and learners learn. In affected versions are affected by a Server-Side Request Forgery (SSRF) vulnerability. In an `insertDocument` API request the user is able to supply a URL from which the presen

01What is this vulnerability?

BigBlueButton is an open source virtual classroom designed to help teachers teach and learners learn. In affected versions are affected by a Server-Side Request Forgery (SSRF) vulnerability. In an `insertDocument` API request the user is able to supply a URL from which the presentation should be downloaded. This URL was being used without having been successfully validated first. An update to the…

02Affected products

Vendor	Product	Versions
bigbluebutton	bigbluebutton	>= 2.6.0, < 2.6.9, < 2.5.18

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

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

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: 2023-06-26T19:50:25.212Z
• Last modified: 2024-11-12T15:18:46.803Z

09References

• github.com — https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-3q22-hph…
• github.com — https://github.com/bigbluebutton/bigbluebutton/pull/18045
• github.com — https://github.com/bigbluebutton/bigbluebutton/pull/18052
• github.com — https://github.com/bigbluebutton/bigbluebutton/commit/43394dade595d0707384e48783…
• github.com — https://github.com/bigbluebutton/bigbluebutton/commit/b18aff32e65a47f1eb2c800e86…