What’s Vulnerable › Vulnerabilities

CVE-2026-46404: BigBlueButton: Presentation URL Security Hardening

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-16 · updated 2026-07-17
• Weakness: CWE-918

Description

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.

Affected products

• bigbluebutton: before 3.0.23

References

• https://github.com/bigbluebutton/bigbluebutton/commit/7ccc60c965d744d9fb637715052352a1e59a2c27
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-xqm3-6q7q-4v5h

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