CVE-2026-13426— Client4 fails to validate path parameters
Possible ATT&CK Techniques 1AI
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (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 |
IV. Related Vulnerabilities
Same vendor: Mattermost
- CVE-2026-4339
SSRF via unvalidated attachment URLs in Mattermost Agents pl - CVE-2026-9699
Mattermost Agents plugin logs unsanitized OpenAI API keys on - CVE-2026-3472
Markdown image rendering bypass in AI bot tool result posts - CVE-2026-2299
Improper Access Control in Mattermost Google Drive Plugin Fi - CVE-2026-8823
User Manager can demote bot accounts to guest without bot-ma
Same weakness: CWE-22
- CVE-2026-54557
mise HTTP backend uses raw version path for install symlink - CVE-2026-56876
extract-zip unvalidated symlink path traversal - CVE-2026-55677
Echo: Encoded slash (%2F) bypasses route-level protection an - CVE-2026-57321
WordPress H5P plugin <= 1.17.7 - Arbitrary File Deletion vul - CVE-2026-56066
WordPress ShortPixel Adaptive Images plugin <= 3.11.4 - Arbi
V. Comments for CVE-2026-13426
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