CVE-2026-13426— Client4 fails to validate path parameters
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | github.com/mattermost/mattermost/server/public | v0.0.0< v0.1.22 | affected |
v0.1.22 | unaffected |
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I. Basic Information for CVE-2026-13426
Vulnerability Information
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Vulnerability Title
Client4 fails to validate path parameters
Source: CVE Program / CVE List V5
Vulnerability Description
The Mattermost Go module github.com/mattermost/mattermost/server/public versions < v0.1.22 fail to validate path parameters when constructing API route paths which allows an attacker to redirect API calls to unintended endpoints via crafted IDs containing path traversal components. Mattermost Advisory ID: MMSA-2025-00532
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司开源的一个开源协作平台。 Mattermost v0.1.22之前版本存在路径遍历漏洞，该漏洞源于在构造API路由路径时未验证路径参数，允许攻击者通过包含路径遍历组件的特制ID将API调用重定向到非预期端点。
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 | github.com/mattermost/mattermost/server/public | v0.0.0 ~ v0.1.22 | - |
II. Public POCs for CVE-2026-13426
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2026-06-26 · 4 CVEs total
| CVE-2026-9699 | 6.8 MEDIUM | Mattermost Agents plugin logs unsanitized OpenAI API keys on authentication errors |
| CVE-2026-4339 | 6.5 MEDIUM | SSRF via unvalidated attachment URLs in Mattermost Agents plugin MCP server |
| CVE-2026-3472 | 3.5 LOW | Markdown image rendering bypass in AI bot tool result posts in Mattermost |
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Same weakness: CWE-22
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V. Comments for CVE-2026-13426
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