CVE-2023-2831— Denial of Service while unescaping a Markdown string
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I. Basic Information for CVE-2023-2831
Vulnerability Information
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Vulnerability Title
Denial of Service while unescaping a Markdown string
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost fails to unescape Markdown strings in a memory-efficient way, allowing an attacker to cause a Denial of Service by sending a message containing a large number of escaped characters.
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，该漏洞源于无法取消转义Markdown字符串，导致攻击者可以通过发送包含大量转义字符的消息来造成拒绝服务。
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 ~ 7.1.9 | - |
II. Public POCs for CVE-2023-2831
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Same Patch Batch · Mattermost · 2023-06-16 · 11 CVEs total
| CVE-2023-2793 | 6.5 MEDIUM | Stack exhaustion in PreparePostForClientWithEmbedsAndImages |
| CVE-2023-2792 | 6.5 MEDIUM | Ephemeral messages return private channel contents in permalink previews |
| CVE-2023-2787 | 6.5 MEDIUM | Collapsed Reply Threads APIs leak message contents from private channels |
| CVE-2023-2788 | 6.2 MEDIUM | Deactivated user can retain access using oauth2 api |
| CVE-2023-2785 | 4.3 MEDIUM | Specially crafted search query can cause large log entries in postgres |
| CVE-2023-2791 | 4.3 MEDIUM | Playbooks lets you edit arbitrary posts |
| CVE-2023-2786 | 4.3 MEDIUM | Channel commands execution doesn't properly verify permissions |
| CVE-2023-2783 | 4.3 MEDIUM | App Framework does not checks for the secret provided in the incoming webhook request |
| CVE-2023-2784 | 4.2 MEDIUM | Apps Framework allows install requests from regular members via an internal path |
| CVE-2023-2797 | 3.1 LOW | Path traversal in GitHub plugin's code preview feature |
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-400
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FastGPT: Uncontrolled Resource Consumption leading to Sandbo - CVE-2026-42212
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Unbounded exponent in decimal enables unauthenticated DoS - CVE-2026-20188
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V. Comments for CVE-2023-2831
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