CVE-2026-28736— Focalboard IDOR in file content endpoint allows cross-user file access (unsupported product, no fix)
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I. Basic Information for CVE-2026-28736
Vulnerability Information
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Vulnerability Title
Focalboard IDOR in file content endpoint allows cross-user file access (unsupported product, no fix)
Source: NVD (National Vulnerability Database)
Vulnerability Description
** UNSUPPORTED WHEN ASSIGNED ** Focalboard version 8.0 fails to validate file ownership when serving uploaded files. This allows an authenticated attacker who knows a victim's fileID to read the content of the file. NOTE: Focalboard as a standalone product is not maintained and no fix will be issued.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: NVD (National Vulnerability Database)
Vulnerability Title
Focalboard 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Focalboard是Mattermost Community开源的一个多语言、自托管的项目管理工具。 Focalboard 8.0版本存在安全漏洞，该漏洞源于提供上传文件时未验证文件所有权，可能导致知道受害者文件ID的经过身份验证的攻击者读取文件内容。
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 |
|---|---|---|---|---|
| Mattermost | Focalboard | 0 ~ 8.0 | - |
II. Public POCs for CVE-2026-28736
| # | POC Description | Source Link | Shenlong Link |
|---|
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