What’s Vulnerable › Vulnerabilities

CVE-2020-28953

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-11-19 · updated 2026-06-17

Description

In BigBlueButton before 2.2.29, a user can vote more than once in a single poll.

Affected products

• bigbluebutton: before 2.2.29 — fixed in 2.2.29

How to fix

Upgrade to a fixed version: bigbluebutton 2.2.29. Check the vendor advisory for mitigations.

References

• https://github.com/bigbluebutton/bigbluebutton/commit/d2cb02b3bd670265c6b1ba003f87fc261e0ac3e1
• https://github.com/bigbluebutton/bigbluebutton/compare/v2.2.28...v2.2.29
• https://github.com/bigbluebutton/bigbluebutton/commit/d2cb02b3bd670265c6b1ba003f87fc261e0ac3e1
• https://github.com/bigbluebutton/bigbluebutton/compare/v2.2.28...v2.2.29

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