{"cve":{"cve_id":"CVE-2020-26260","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":0.00827,"epss_percentile":0.52697,"epss_as_of":"2026-06-23","description":"BookStack is a platform for storing and organising information and documentation. In BookStack before version 0.30.5, a user with permissions to edit a page could set certain image URL's to manipulate functionality in the exporting system, which would allow them to make server side requests and/or have access to a wider scope of files within the BookStack file storage locations. The issue was addressed in BookStack v0.30.5. As a workaround, page edit permissions could be limited to only those that are trusted until you can upgrade.","published_at":"2020-12-09T16:20:14Z","last_modified_at":null,"cvss_v3_score":6.4,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/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-74"],"nvd_references":["https://github.com/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7cr","https://bookstackapp.com/blog/beta-release-v0-30-5/","https://github.com/BookStackApp/BookStack/releases/tag/v0.30.5"],"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":"2026-06-28T23:13:56.882959Z"},"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":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"bookstackapp","vendor_name":"bookstackapp","product_slug":"bookstack","product_name":"bookstack","version_start":">= v0.7, < v0.30.5","version_start_inclusive":true,"version_end":">= v0.7, < v0.30.5","version_end_inclusive":true,"cpe23_uri":"cve5:bookstackapp:bookstack:>= v0.7, < v0.30.5:>= v0.7, < v0.30.5"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7cr","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://bookstackapp.com/blog/beta-release-v0-30-5/","source_type":"MISC","tags":[]},{"url":"https://github.com/BookStackApp/BookStack/releases/tag/v0.30.5","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2020-12-09T16:20:14Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:03:22.292184Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:03:22.292184Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:03:22.292184Z","label":"CVSS score revised","source":"cvelistv5"}]}