EUVD-2026-72301
GHSA-9rg8-hwc3-hh5g
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
Authenticated low-privileged user required (PR:L); only attachment metadata disclosed (C:L); no integrity or availability impact.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
5DescriptionCVE.org
A vulnerability was detected in BookStack up to 26.05.2. Affected by this issue is the function AttachmentController::getUpdateForm of the file app/Uploads/Controllers/AttachmentController.php of the component Attachment Edit Endpoint. The manipulation of the argument ID results in improper access controls. The attack may be launched remotely. The exploit is now public and may be used. The patch is identified as 4e406c41c4c8060a5795e74c66fb96362e54f400. It is advisable to implement a patch to correct this issue.
AnalysisAI
Improper access control in BookStack ≤26.05.2 allows authenticated low-privileged users to retrieve attachment edit form data for attachments on pages they are not authorized to access, by manipulating the ID parameter in requests to AttachmentController::getUpdateForm. The missing authorization check constitutes an Insecure Direct Object Reference (IDOR), leaking attachment metadata across permission boundaries. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid BookStack account with at least the lowest privilege tier (PR:L); unauthenticated exploitation is not possible per the CVSS 4.0 PR:L metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/E:P) accurately reflects the real-world risk profile: network-reachable, low complexity, but requiring a valid low-privilege account, with impact limited to low confidentiality (attachment metadata/form data only). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor patch by upgrading BookStack to the first release incorporating commit 4e406c41c4c8060a5795e74c66fb96362e54f400; check the BookStack Codeberg releases page to identify the exact patched version. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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