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permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.

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History

Sat, 24 Oct 2026 11:45:00 +0000

Type Values Removed Values Added
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permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.
Title BookStack before 26.09.2 Incorrect Authorization via AttachmentController on Draft Pages
First Time appeared Bookstackapp
Bookstackapp bookstack
Weaknesses CWE-863
CPEs cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*
Vendors & Products Bookstackapp
Bookstackapp bookstack
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.3, '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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-24T11:40:36.328Z

Reserved: 2026-10-24T11:23:57.535Z

Link: CVE-2026-116020

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-24T12:16:58.660

Modified: 2026-10-24T12:16:58.660

Link: CVE-2026-116020

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-24T12:45:06Z

Weaknesses