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Vulnerabilities

Vulnerability · CVE-2025-55200

BigBlueButton is an open-source virtual classroom.

Published Oct 9, 2025 · catalog updated Oct 9, 2025 · BigBlueButton is an open-source

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-55200. EPSS is 0.25%. Act only if a listed version of BigBlueButton is an open-source is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (BigBlueButton is an open-source).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.25%
Remediation
Version ranges on file
Affected products
vendor bigbluebutton bigbluebutton < 3.0.13

BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.13, the "Shared Notes" feature contains a Stored Cross-Site Scripting (XSS) vulnerability with the input location being the "Username" field and the output location on the "Shared Notes" page, when a user with a malicious username is editing content. This vulnerability allows a low-privileged user to execute arbitrary JavaScript in the context of higher-privileged users (e.g., Admins) who open the Shared Notes page. Version 3.0.13 fixes the issue.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor bigbluebutton bigbluebutton < 3.0.13< 3.0.13

How to fix CVE-2025-55200

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-55200. EPSS is 0.25%. Act only if a listed version of BigBlueButton is an open-source is installed.

Which versions are affected?

Compare what you have installed with bigbluebutton bigbluebutton < 3.0.13 < 3.0.13. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.25%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 9, 2025 · EUVD

    Detected

    BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.13, the "Shared Notes" feature contains a Stored Cross-Site Scripting (XSS) vulnerability with the input location being the "Username" field and the output location on the "Shared Notes" page, when a user with a malicious username is editing content. This vulnerability allows a low-privileged user to execute arbitrary Java

  2. Oct 9, 2025 · EUVD

    Updated

    BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.13, the "Shared Notes" feature contains a Stored Cross-Site Scripting (XSS) vulnerability with the input location being the "Username" field and the output location on the "Shared Notes" page, when a user with a malicious username is editing content. This vulnerability allows a low-privileged user to execute arbitrary Java

Sources

  • CVE.orgVulnerability recordCVE-2025-55200

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-55200

    30-day exploitation probability 0.25%

    first.org
  • EUVDVulnerability recordEUVD-2025-33584

    BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.13, the "Shared Notes" feature contains a Stored Cross-Site Scripting (XSS) vulnerability with the input location being the "Username" field and the output location on the "Shared Notes" page, when a user

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 7, 2026
  • CVE.orgOct 23, 2026
  • EUVDOct 23, 2026