{"id":"CVE-2025-55200","aliases":["EUVD-2025-33584","GHSA-9jv9-cjrm-grj2"],"status":"published","title":"BigBlueButton vulnerable to Stored XSS via name of user at Shared Notes","description":"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.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00249,"percentile":0.16345,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2025-10-09T18:51:57Z","modified":"2026-10-28T02:30:40Z","products":[{"vendor":"bigbluebutton","product":"bigbluebutton"}],"references":[{"url":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-9jv9-cjrm-grj2","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory"]},{"url":"https://github.com/bigbluebutton/bbb-pads/pull/67","tags":["x_refsource_MISC","Issue Tracking","Product","fix"]},{"url":"https://github.com/bigbluebutton/bigbluebutton/pull/23693","tags":["x_refsource_MISC","Issue Tracking","Patch","fix"]},{"url":"https://github.com/bigbluebutton/bbb-pads/releases/tag/v1.5.4","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55200.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-55200","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-55200","title":"BigBlueButton vulnerable to Stored XSS via name of user at Shared Notes","description":"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.","status":"published","published":"2025-10-09T18:51:57.884Z","modified":"2025-10-09T19:08:17.415Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:32:52.839698Z"}],"euvd":[{"id":"EUVD-2025-33584","description":"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.","status":"published","published":"2025-10-09T18:51:57Z","modified":"2025-10-09T19:08:17Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"updated_at":"2026-11-02T20:31:34.46826Z"}],"nvd":[{"id":"CVE-2025-55200","description":"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.","status":"published","published":"2025-10-09T19:15:43.663Z","modified":"2026-10-19T16:10:00.26Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:11:36.851295Z"}],"osv":[{"id":"CVE-2025-55200","title":"BigBlueButton vulnerable to Stored XSS via name of user at Shared Notes","description":"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.","status":"published","published":"2025-10-09T18:51:57.884Z","modified":"2026-10-28T02:30:40.211555144Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:44:50.863921Z"}]}}