EUVD-2026-18819
GHSA-h29h-hh8g-q4wh
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
5DescriptionCVE.org
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.
AnalysisAI
BookStack chapter export functionality allows unauthenticated remote attackers to bypass access controls via manipulation of the pages parameter in the chapterToMarkdown function, enabling improper access to restricted content. Affects BookStack versions up to 26.03; patch available in version 26.03.1. …
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Vulnerability AssessmentAI
| Risk Assessment | CVSS 5.5 with vector AV:N/AC:L/PR:N/UI:N indicates network-accessible, low-complexity attack requiring no user interaction or privileges-a straightforward exploitation path. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated remote attacker crafts a malicious chapter export request by manipulating the pages parameter to include pages they should not have access to, then exports the chapter to markdown format. The export handler fails to validate access controls, returning the restricted content in the exported file. … |
| Remediation | Vendor-released patch: upgrade to BookStack version 26.03.1 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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