PT-2026-30222 · Bookstackapp · Bookstack

Ghufran Khan · Published 2026-04-03 · Updated 2026-04-03 · CVE-2026-5484

NVD

CVSS v2.0

5.0

Medium

Base vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

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.

Exploit

Fix

Improper Access Control

Incorrect Privilege Assignment

Weakness Enumeration

CWE-284

CWE-266

Related Identifiers

CVE-2026-5484

Affected Products

Bookstack

References · 9

• 🔥 https://github.com/Ghufran2/CVE-Bookstack/blob/main/Permission%20Bypass%20in%20Markdown%20Chapter%20Export · Exploit
• https://github.com/BookStackApp/BookStack/commit/8a59895ba063040cc8dafd82e94024c406df3d04 · Patch
• https://github.com/BookStackApp/BookStack/releases/tag/v26.03.1 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-5484 · Security Note
• https://vuldb.com/submit/781762 · Note
• https://github.com/BookStackApp/BookStack · Note
• https://bookstackapp.com/blog/bookstack-release-v26-03-1 · Note
• https://vuldb.com/vuln/355091 · Note
• https://vuldb.com/vuln/355091/cti · Note