{"affected":[{"defaultStatus":"unaffected","product":"BookStack","source":"CNA: VulnCheck","vendor":"BookStackApp","versions":[{"lessThan":"26.09.2","status":"affected","version":"0","versionType":"custom"}]}],"cveId":"CVE-2026-116020","cwes":["CWE-863"],"description":"BookStack before 26.09.2 contains an incorrect authorization vulnerability in AttachmentController that allows authenticated users to access other users' draft page attachments by ID. Attackers with attachment permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.","epss":{"date":"2026-11-05","percentile":0.07736,"score":0.00181},"exploits":[],"kev":null,"metrics":[{"score":5.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},{"score":5.4,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"}],"modifiedAt":1793899805764,"publishedAt":1792842036328,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://codeberg.org/bookstack/bookstack/commit/fcadecccda706b4ecaf9ac3f8e27defe0ebe78ae"},{"source":"CNA: VulnCheck","tags":["vendor-advisory","release-notes"],"url":"https://www.bookstackapp.com/blog/bookstack-release-v26-09-2/"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://codeberg.org/bookstack/bookstack/releases/tag/v26.09.2"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://codeberg.org/bookstack/bookstack/src/tag/v26.09.1/app/Uploads/Controllers/AttachmentController.php"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/bookstack-before-26.09.2-incorrect-authorization-via-attachmentcontroller-on-draft-pages"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://codeberg.org/bookstack/bookstack/commit/fcadecccda706b4ecaf9ac3f8e27defe0ebe78ae"}],"revision":"847359df38e5667f976f9523313eabb796e3ceaaf2f3574f03935da2732f6e02","sources":[{"modifiedAt":1793899805764,"name":"CNA: VulnCheck","retrievedAt":1793902169308,"url":"https://www.cve.org/CVERecord?id=CVE-2026-116020"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793902199864,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-116020"}],"ssvc":{"assessedAt":1793899789538,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"BookStack before 26.09.2 Incorrect Authorization via AttachmentController on Draft Pages","updatedAt":1793902199864}