{"id":"CVE-2026-27737","state":"PUBLISHED","title":"BigBlueButton has Stored XSS in bbb-playback replay","description":"BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording. This issue has been fixed 3.0.19.","publishedAt":"2026-05-18T21:11:17.611Z","updatedAt":"2026-05-19T12:11:53.931Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["bigbluebutton bigbluebutton","blindsidenetworks scalite","bigbluebutton bbb-playback"],"affected":[{"vendor":"bigbluebutton","product":"bigbluebutton","versions":[{"version":"< 3.0.19","status":"affected"}]},{"vendor":"blindsidenetworks","product":"scalite","versions":[{"version":"< 1.7.0","status":"affected"}]},{"vendor":"bigbluebutton","product":"bbb-playback","versions":[{"version":"< 5.4.3","status":"affected"}]}],"references":["https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv","https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1","https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc","https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19","https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/27xxx/CVE-2026-27737.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27737","state":"PUBLISHED","datePublished":"2026-05-18T21:11:17.611Z","dateUpdated":"2026-05-19T12:11:53.931Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-23T18:37:14.790Z"},"containers":{"cna":{"title":"BigBlueButton has Stored XSS in bbb-playback replay","descriptions":[{"lang":"en","value":"BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording. This issue has been fixed 3.0.19."}],"affected":[{"vendor":"bigbluebutton","product":"bigbluebutton","versions":[{"version":"< 3.0.19","status":"affected"}]},{"vendor":"blindsidenetworks","product":"scalite","versions":[{"version":"< 1.7.0","status":"affected"}]},{"vendor":"bigbluebutton","product":"bbb-playback","versions":[{"version":"< 5.4.3","status":"affected"}]}],"references":[{"url":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv","name":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1","name":"https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1","tags":["x_refsource_MISC"]},{"url":"https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc","name":"https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc","tags":["x_refsource_MISC"]},{"url":"https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19","name":"https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19","tags":["x_refsource_MISC"]},{"url":"https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0","name":"https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-18T21:11:17.611Z"},"source":{"advisory":"GHSA-8vv7-vj94-q2pv","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-19T12:11:45.789071Z","id":"CVE-2026-27737","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-19T12:11:53.931Z"}}]}}}