{"cve":{"cve_id":"CVE-2026-27737","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00257,"epss_percentile":0.16817,"epss_as_of":"2026-06-23","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.","published_at":"2026-05-18T21:11:17.611000Z","last_modified_at":null,"cvss_v3_score":6.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-79"],"nvd_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"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:29:33.429447Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"bigbluebutton","vendor_name":"bigbluebutton","product_slug":"bbb-playback","product_name":"bbb-playback","version_start":"< 5.4.3","version_start_inclusive":true,"version_end":"< 5.4.3","version_end_inclusive":true,"cpe23_uri":"cve5:bigbluebutton:bbb-playback:< 5.4.3:< 5.4.3"},{"vendor_slug":"bigbluebutton","vendor_name":"bigbluebutton","product_slug":"bigbluebutton","product_name":"bigbluebutton","version_start":"< 3.0.19","version_start_inclusive":true,"version_end":"< 3.0.19","version_end_inclusive":true,"cpe23_uri":"cve5:bigbluebutton:bigbluebutton:< 3.0.19:< 3.0.19"},{"vendor_slug":"blindsidenetworks","vendor_name":"blindsidenetworks","product_slug":"scalite","product_name":"scalite","version_start":"< 1.7.0","version_start_inclusive":true,"version_end":"< 1.7.0","version_end_inclusive":true,"cpe23_uri":"cve5:blindsidenetworks:scalite:< 1.7.0:< 1.7.0"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-05-18T21:11:17.611000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:52:22.671512Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:52:22.671512Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:52:22.671512Z","label":"CVSS score revised","source":"cvelistv5"}]}