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CVE-2026-5484

5.3 · MEDIUM

A weakness has been identified in BookStackApp BookStack up to 26.03.

Published Apr 3, 2026CWE-266EPSS 0.55%

Overview

CVE-2026-5484 is a medium-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/BookStackApp/BookStack/GitHubgithub.com/BookStackApp/BookStack/commit/8a59895ba063040cc8dafd82e94024c406df3d04GitHubgithub.com/BookStackApp/BookStack/releases/tag/v26.03.1GitHubgithub.com/Ghufran2/CVE-Bookstack/blob/main/Permission%20Bypass%20in%20Markdown%20Chapter%20ExportRefvuldb.com/submit/781762Refvuldb.com/vuln/355091Refvuldb.com/vuln/355091/ctiRefwww.bookstackapp.com/blog/bookstack-release-v26-03-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2026-5484?

CVE-2026-5484 is a medium-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-5484?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-5484?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-5484?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-5484 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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