[UPDATE] [high] BigBlueButton: Multiple vulnerabilities

highCVE-2026-46351 CVE-2026-46353 CVE-2026-46404

A remote, authenticated attacker can exploit multiple vulnerabilities in BigBlueButton to bypass security measures and disclose confidential information.

CSIRTS triage

vendor: BigBlueButton product: BigBlueButton Authentication bypass Information disclosure

What: Multiple vulnerabilities allow bypassing security measures and disclosing confidential information.
Who is affected: Remote, authenticated attackers can exploit vulnerabilities in BigBlueButton.
Urgency: Remediation is high urgency due to the high severity of the vulnerabilities.
Action: Update to the latest version to mitigate the vulnerabilities.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch BigBlueButton

Get an email when a new BigBlueButton advisory drops — max one per day, one-click unsubscribe.

Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-07-17
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1568

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-463510.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all scored CVEs.
Low exploitation riskCVE-2026-463530.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all scored CVEs.
Low exploitation riskCVE-2026-464040.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-46351	coverage & exploitation status	NVD · CVE.org
CVE-2026-46353	coverage & exploitation status	NVD · CVE.org
CVE-2026-46404	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for BigBlueButton

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-46404: BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, the presentation URL valid…nvd · 2026-07-16
highCVE-2026-46353: BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web checksum validatio…nvd · 2026-07-16
highCVE-2026-46351: BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web generated conferen…nvd · 2026-07-16