CVE-2026-116020

BookStack before 26.09.2 Incorrect Authorization via AttachmentController on Draft Pages

Published Oct 24, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.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

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 5, 2026, 5:30 PM
Reserved
Oct 24, 2026, 11:23 AM
Status
Awaiting Analysis
Published
Oct 24, 2026, 12:16 PM
Modified
Nov 5, 2026, 6:17 PM