What’s Vulnerable › Vulnerabilities

CVE-2023-42804: BigBlueButton Path Traversal – Reading Certain File Extensions

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-30 · updated 2026-06-17
• Weakness: CWE-22

Description

BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.1 has a path traversal vulnerability that allows an attacker with a valid starting folder path, to traverse and read other files without authentication, assuming the files have certain extensions (txt, swf, svg, png). In version 2.6.0-beta.1, input validation was added on the parameters being passed and dangerous characters are stripped. There are no known workarounds.

Affected products

• bigbluebutton: through 2.5.18; 2.6.0-alpha1, 2.6.0-alpha2, 2.6.0-alpha3, 2.6.0-alpha4

References

• https://github.com/bigbluebutton/bigbluebutton/pull/15960
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-3qjg-229m-vq84
• https://github.com/bigbluebutton/bigbluebutton/pull/15960
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-3qjg-229m-vq84

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