{"cve":{"cve_id":"CVE-2020-11055","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":0.00782,"epss_percentile":0.5121,"epss_as_of":"2026-06-23","description":"In BookStack greater than or equal to 0.18.0 and less than 0.29.2, there is an XSS vulnerability in comment creation. A user with permission to create comments could POST HTML directly to the system to be saved in a comment, which would then be executed/displayed to others users viewing the comment. Through this vulnerability custom JavaScript code could be injected and therefore ran on other user machines. This most impacts scenarios where not-trusted users are given permission to create comments. This has been fixed in 0.29.2.","published_at":"2020-05-07T20:40:14Z","last_modified_at":null,"cvss_v3_score":6.3,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","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/BookStackApp/BookStack/security/advisories/GHSA-5vf7-q87h-pg6w","https://bookstackapp.com/blog/beta-release-v0-29-2/","https://github.com/BookStackApp/BookStack/releases/tag/v0.29.2","http://jvn.jp/en/jp/JVN41035278/index.html"],"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":"2026-06-28T23:13:17.556569Z"},"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":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"bookstackapp","vendor_name":"bookstackapp","product_slug":"bookstack","product_name":"bookstack","version_start":">= 0.18.0, < 0.29.2","version_start_inclusive":true,"version_end":">= 0.18.0, < 0.29.2","version_end_inclusive":true,"cpe23_uri":"cve5:bookstackapp:bookstack:>= 0.18.0, < 0.29.2:>= 0.18.0, < 0.29.2"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/BookStackApp/BookStack/security/advisories/GHSA-5vf7-q87h-pg6w","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://bookstackapp.com/blog/beta-release-v0-29-2/","source_type":"MISC","tags":[]},{"url":"https://github.com/BookStackApp/BookStack/releases/tag/v0.29.2","source_type":"PATCH","tags":["patch"]},{"url":"http://jvn.jp/en/jp/JVN41035278/index.html","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2020-05-07T20:40:14Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:02:00.430480Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:02:00.430480Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:02:00.430480Z","label":"CVSS score revised","source":"cvelistv5"}]}