CVE-2023-6202— Insecure Direct Object Reference in /plugins/focalboard/ api/v2/users of Mattermost Boards
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I. Basic Information for CVE-2023-6202
Vulnerability Information
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Vulnerability Title
Insecure Direct Object Reference in /plugins/focalboard/ api/v2/users of Mattermost Boards
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost fails to perform proper authorization in the /plugins/focalboard/api/v2/users endpoint allowing an attacker who is a guest user and knows the ID of another user to get their information (e.g. name, surname, nickname) via Mattermost Boards.
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
访问控制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 存在安全漏洞，该漏洞源于无法在 /plugins/focalboard/api/v2/users 端点中执行适当的授权，从而允许作为访客用户且知道其他用户 ID 的攻击者通过 Mattermost Boards 获取其信息（例如姓名、昵称）。
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 | Mattermost | 0 ~ 7.8.12 | - |
II. Public POCs for CVE-2023-6202
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2023-11-27 · 9 CVEs total
| CVE-2023-47168 | 4.3 MEDIUM | Open redirect in /oauth/<service>/mobile_login?redirect_to= |
| CVE-2023-43754 | 4.3 MEDIUM | Permalink previews displayed for posts in archived channels even if users are disallowed t |
| CVE-2023-48369 | 4.3 MEDIUM | Log Flooding due to specially crafted requests in different endpoints |
| CVE-2023-40703 | 4.3 MEDIUM | Denial of Service via specially crafted block fields in Mattermost Boards |
| CVE-2023-48268 | 4.3 MEDIUM | Denial of Service via Board Import Zip Bomb |
| CVE-2023-45223 | 4.3 MEDIUM | Users full name disclosure through Mattermost Boards with Show Full Name Option disabled |
| CVE-2023-47865 | 4.3 MEDIUM | Username and Icon override can be used by members when Hardened Mode is enabled |
| CVE-2023-35075 | 3.1 LOW | HTML injection via channel autocomplete |
IV. Related Vulnerabilities
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Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same vendor: Mattermost
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same weakness: CWE-284
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Dotouch XproUPF access control - CVE-2026-42569
phpvms: /importer authorization bypass causing full database - CVE-2026-42205
Avo: Broken Access Control: Unauthorized Execution of Arbitr - CVE-2026-41487
Langfuse: Improper role-based-access control in Langfuse LLM - CVE-2026-42278
UltraDAG: Smart Account Spending Policy Bypass via Pockets
V. Comments for CVE-2023-6202
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