{"id":"CVE-2026-116020","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-116020","generatedAt":"2026-10-27T23:50:17.854Z","title":"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.","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permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.","published":"2026-10-24T12:16:59.000Z","lastModified":"2026-10-26T18:39:43.000Z","status":"Awaiting Analysis","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":5.3,"severity":"MEDIUM","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-863"],"affected":[],"epss":{"score":0.00181,"percentile":0.07597,"date":"2026-10-26","history":[{"date":"2026-10-25","score":0.00181,"percentile":0.07599}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.18%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-24T12:16:59.000Z","detail":{"score":"5.3","severity":"MEDIUM","publishedAt":"2026-10-24T12:16:58.660Z"},"summary":"New CVE, medium severity (CVSS 5.3)."}],"references":[{"url":"https://codeberg.org/bookstack/bookstack/commit/fcadecccda706b4ecaf9ac3f8e27defe0ebe78ae","source":"disclosure@vulncheck.com"},{"url":"https://codeberg.org/bookstack/bookstack/releases/tag/v26.09.2","source":"disclosure@vulncheck.com"},{"url":"https://codeberg.org/bookstack/bookstack/src/tag/v26.09.1/app/Uploads/Controllers/AttachmentController.php","source":"disclosure@vulncheck.com"},{"url":"https://www.bookstackapp.com/blog/bookstack-release-v26-09-2/","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/bookstack-before-26.09.2-incorrect-authorization-via-attachmentcontroller-on-draft-pages","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-116020","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}