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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.

在 BookStack 26.05.2 及更早版本中发现一个漏洞。该问题影响了组件“附件编辑端点”中文件内的函数。对参数的操纵会导致访问控制不当（Improper Access Controls）。该攻击可通过远程发起。此漏洞的利用方式（exploit）现已公开，可能被实际利用。修复补丁的提交标识为。建议应用该补丁以修复此问题。

CVSS 4.3 · Medium Updated Sep 07, 2026

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

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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

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

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-86285

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Other References for CVE-2026-86285 (1)

🔗 CVE-2026-86285 BookStack Attachment Edit Endpoint AttachmentController.php getUpdateForm access control vdb-entry technical-description

Other References for CVE-2026-86285 (4)

🔗 https://codeberg.org/bookstack/bookstack/commit/4e406c41c4c8060a5795e74c66fb96362e54f400 patch
https://ashutosh-jena.in/blog/broken-access-control-in-bookstack-how-a-missing-permission-check-leaked-attachment-data exploit
🔗 CVE-2026-86285 in BookStack third-party-advisory
🔗 Submit #905693: BookStack 26.05.2 Missing authorization / Broken Access Control third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-86285

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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Goal Reached Thanks to every supporter — we hit 100%!

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

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2026-86285

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-86285

III. Intelligence Information for CVE-2026-86285

Other References for CVE-2026-86285 (1)

Other References for CVE-2026-86285 (4)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-86285

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