CVE-2026-46404: BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, the presentation URL validation did not properly restrict access to site local and link local addresses. The red

mediumCVSS 6.8CVE-2026-46404

BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, the presentation URL validation did not properly restrict access to site local and link local addresses. The redirect following logic now pins resolved IPs. This issue is fixed in version 3.0.23.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 6.8
Published: 2026-07-16
Last updated: 2026-07-17
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-46404

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-2026-464040.26% 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-2026-46404	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] BigBlueButton: Multiple vulnerabilitiescert-bund

Recent advisories for BigBlueButton is an

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.

high[UPDATE] [high] BigBlueButton: Multiple vulnerabilitiescert-bund · 2026-07-17
highCVE-2026-46353: BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web checksum validatio…nvd · 2026-07-16
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