What’s Vulnerable › Vulnerabilities

CVE-2020-27608

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-10-21 · updated 2026-06-17
• Weakness: CWE-79

Description

In BigBlueButton before 2.2.28 (or earlier), uploaded presentations are sent to clients without a Content-Type header, which allows XSS, as demonstrated by a .png file extension for an HTML document.

Affected products

• bigbluebutton: before 2.2.28 — fixed in 2.2.28

How to fix

Upgrade to a fixed version: bigbluebutton 2.2.28. Check the vendor advisory for mitigations.

References

• https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html
• https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html

Get alerted when CVE-2020-27608 or the next vulnerability affects your stack