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permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.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: 2026-10-24
Score: 5.3 Medium
EPSS: n/a
KEV: No
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No solution or workaround provided in the CVE record.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

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permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.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


Subscriptions

Bookstackapp Bookstack
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: 2026-10-24T12:30:08Z

Weaknesses