CVE-2023-40703— Denial of Service via specially crafted block fields in Mattermost Boards
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I. Basic Information for CVE-2023-40703
Vulnerability Information
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Vulnerability Title
Denial of Service via specially crafted block fields in Mattermost Boards
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the field of a block using a specially crafted string.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mattermost 资源管理错误漏洞
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，该漏洞源于无法正确限制 Mattermost Boards 中块的不同字段中允许的字符，从而允许攻击者通过使用特制字符串修补块的字段来消耗过多的资源，可能导致拒绝服务。
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-2023-40703
| # | 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-2023-6202 | 4.3 MEDIUM | Insecure Direct Object Reference in /plugins/focalboard/ api/v2/users of Mattermost Boards |
| 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-2023-48268 | 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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Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
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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-400
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V. Comments for CVE-2023-40703
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