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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/BookStackApp/BookStack/
- https://github.com/BookStackApp/BookStack/commit/8a59895ba063040cc8dafd82e94024c
- https://github.com/BookStackApp/BookStack/releases/tag/v26.03.1
- https://github.com/Ghufran2/CVE-Bookstack/blob/main/Permission%20Bypass%20in%20M
- https://vuldb.com/submit/781762
- https://vuldb.com/vuln/355091
- https://vuldb.com/vuln/355091/cti
- https://www.bookstackapp.com/blog/bookstack-release-v26-03-1/
FAQ
What is CVE-2026-5484?
CVE-2026-5484 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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. Ex...
How severe is CVE-2026-5484?
CVE-2026-5484 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-5484?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.