CVE-2026-13426— Client4 fails to validate path parameters
Quick assessment
Affected
Mattermost github.com/mattermost/mattermost/server/public
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Possible ATT&CK Techniques 1 AI
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 |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-13426
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
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 |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-13426
请登录查看更多情报信息。
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-2026-18799
Mattermost Server fails to restrict Slack import account bin -
CVE-2026-16251
Mattermost local image proxy allows server memory exhaustion -
CVE-2026-18256
Private team metadata disclosure via the team search API -
CVE-2026-18223
Mattermost invitation tokens not bound to invited email addr -
CVE-2026-19076
Mattermost fails to reject OAuth application sessions in acc
Same weakness: CWE-22
-
CVE-2026-113392
DrayTek Vigor2960 Apmupload mainfunction.cgi path traversal -
CVE-2026-113352
uTox through 0.18.1 Path Traversal via Auto-Accepted File Tr -
CVE-2026-112372
H3C Magic NX15 upload importprofile path traversal -
CVE-2026-53995
MLflow 3.17.1 Path Traversal via Trace ID API -
CVE-2026-112302
kiwilan php-archive Extraction ArchiveZip.php extract path t
V. Comments for CVE-2026-13426
No comments yet