What’s Vulnerable › Vulnerabilities

CVE-2021-4143: Cross-site Scripting (XSS) - Generic in bigbluebutton/bigbluebutton

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-19 · updated 2026-06-17
• Weakness: CWE-79

Description

Cross-site Scripting (XSS) - Generic in GitHub repository bigbluebutton/bigbluebutton prior to 2.4.0.

Affected products

• bigbluebutton: before 2.4.0 — fixed in 2.4.0

How to fix

Upgrade to a fixed version: bigbluebutton 2.4.0. Check the vendor advisory for mitigations.

References

• https://github.com/bigbluebutton/bigbluebutton/commit/62040bdcb3c2f993ba72ab89f4db2015e18d1706
• https://huntr.dev/bounties/e67603e6-8497-4ab6-b93a-02c26407d443
• https://github.com/bigbluebutton/bigbluebutton/commit/62040bdcb3c2f993ba72ab89f4db2015e18d1706
• https://huntr.dev/bounties/e67603e6-8497-4ab6-b93a-02c26407d443

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