CVE-2026-5484

MEDIUM

BookStackApp BookStack Chapter Export ExportFormatter.php chapterToMarkdown access control

Title source: cna
STIX 2.1

Description

A weakness has been identified in BookStackApp BookStack up to 26.03. Affected is the function chapterToMarkdown of the file app/Exports/ExportFormatter.php of the component Chapter Export Handler. Executing a manipulation of the argument pages can lead to improper access controls. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 26.03.1 is able to address this issue. This patch is called 8a59895ba063040cc8dafd82e94024c406df3d04. It is advisable to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

References (8)

Core 8
Core References
Vdb Entry, Technical Description vdb-entry technical-description
VDB-355091 | BookStackApp BookStack Chapter Export ExportFormatter.php chapterToMarkdown access control
https://vuldb.com/vuln/355091
Signature, Permissions Required signature permissions-required
VDB-355091 | CTI Indicators (IOB, IOC, TTP, IOA)
https://vuldb.com/vuln/355091/cti
Third Party Advisory third-party-advisory
Submit #781762 | BookstackApp BookStack v25.12.9 Improper Access Controls
https://vuldb.com/submit/781762

Scores

CVSS v3 5.3
EPSS 0.0032
EPSS Percentile 23.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-266 CWE-284
Status published
Products (2)
BookStackApp/BookStack 26.03
BookStackApp/BookStack 26.03.1
Published Apr 03, 2026
Tracked Since Apr 04, 2026