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CVE-2026-5484— BookStackApp BookStack Chapter Export ExportFormatter.php chapterToMarkdown access control

Quick assessment

Affected
BookStackApp BookStack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BookStack是BookStack公司的一个简单、自托管、易于使用的平台。用于组织和存储信息。 BookStack 26.03及之前版本存在访问控制错误漏洞，该漏洞源于参数pages操作不当，可能导致访问控制不当。

CVSS 5.3 · Medium EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5484

Vulnerability Information
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Vulnerability Title
BookStackApp BookStack Chapter Export ExportFormatter.php chapterToMarkdown access control
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
BookStack 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BookStack是BookStack公司的一个简单、自托管、易于使用的平台。用于组织和存储信息。 BookStack 26.03及之前版本存在访问控制错误漏洞，该漏洞源于参数pages操作不当，可能导致访问控制不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
BookStackApp BookStack 26.03 cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-5484

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III. Intelligence Information for CVE-2026-5484

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Patches & Fixes for CVE-2026-5484 (1)

Vendor Advisories for CVE-2026-5484 (2)

Security Blog Posts for CVE-2026-5484 (1)

Vendor Pages for CVE-2026-5484 (1)

Other References for CVE-2026-5484 (1)

IV. Related Vulnerabilities

Same product: BookStack
Same vendor: BookStackApp
Same weakness: CWE-284

V. Comments for CVE-2026-5484

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