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CVE-2026-86285— BookStack Attachment Edit Endpoint AttachmentController.php getUpdateForm access control

Quick assessment

Affected
n/a 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组织开源的一个简单、自托管、易于使用的平台。用于组织和存储信息。 BookStack 26.05.2及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于Attachment Edit Endpoint组件中AttachmentController::getUpdateForm函数对参数ID的操作导致访问控制不当，攻击者可远程利用该漏洞。

CVSS 4.3 · Medium EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 3

VendorProduct Version RangeStatus
n/a BookStack 26.05.0 affected
26.05.1 affected
26.05.2 affected
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I. Basic Information for CVE-2026-86285

Vulnerability Information
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Vulnerability Title
BookStack Attachment Edit Endpoint AttachmentController.php getUpdateForm access control
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BookStack是BookStack组织开源的一个简单、自托管、易于使用的平台。用于组织和存储信息。 BookStack 26.05.2及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于Attachment Edit Endpoint组件中AttachmentController::getUpdateForm函数对参数ID的操作导致访问控制不当，攻击者可远程利用该漏洞。
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
- BookStack 26.05.0 cpe:2.3:a:bookstack:bookstack:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-86285

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III. Intelligence Information for CVE-2026-86285

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Patches & Fixes for CVE-2026-86285 (1)

Vendor Advisories for CVE-2026-86285 (1)

Security Blog Posts for CVE-2026-86285 (1)

Other References for CVE-2026-86285 (2)

Same Patch Batch · n/a · 2026-09-07 · 4 CVEs total

CVE-2026-86271 4.7 MEDIUM FluentCMS PermissionManager.cs GetAccessible authorization
CVE-2026-86289 4.3 MEDIUM Ollama GGUF Decoder gguf.go readGGUFV1String integer overflow
CVE-2026-86244 4.3 MEDIUM FastAdmin User Controller User.php login cross site scripting

IV. Related Vulnerabilities

Same product: BookStack
Same vendor: n/a
Same weakness: CWE-284

V. Comments for CVE-2026-86285

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