CVE-2026-4858— Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 9
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | Mattermost | 11.6.0≤ 11.6.0 | affected |
11.5.0≤ 11.5.3 | affected | ||
11.4.0≤ 11.4.4 | affected | ||
10.11.0≤ 10.11.14 | affected | ||
11.7.0 | unaffected | ||
11.6.1 | unaffected | ||
11.5.4 | unaffected | ||
11.4.5 | unaffected | ||
| … +1 more rows | |||
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I. Basic Information for CVE-2026-4858
Vulnerability Information
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Vulnerability Title
Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path traversal which allows an malicious authenticated user to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL.. Mattermost Advisory ID: MMSA-2026-00640
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
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)
Vulnerability Title
Mattermost 路径遍历漏洞
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 11.6.0及之前的11.6.x版本、11.5.3及之前的11.5.x版本、11.4.4及之前的11.4.x版本和10.11.14及之前的10.11.x版本存在路径遍历漏洞，该漏洞源于未检查集成URL的路径遍历，可能导致恶意经过身份验证的用户通过路径遍历使用系统管理员Mattermost身份验证令牌调用任意API。
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 | 11.6.0 ~ 11.6.0 | - |
II. Public POCs for CVE-2026-4858
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2026-05-21 · 3 CVEs total
| CVE-2026-22880 | 6.1 MEDIUM | Mobile SSO authentication flow allows credential theft via malicious server |
| CVE-2026-4055 | 4.3 MEDIUM | Insufficient permission validation on cross-team playbook run creation |
IV. Related Vulnerabilities
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- CVE-2026-6957
Path traversal in Mattermost Legal Hold plugin via unsanitiz - CVE-2026-4915
Server panic via outgoing webhook responses - CVE-2026-28735
GitHub OAuth Scope Validation - CVE-2026-4635
Persistent notification timing attack causing server denial - CVE-2026-3473
Improper file ownership validation in the Boards API allows
Same vendor: Mattermost
- CVE-2026-6957
Path traversal in Mattermost Legal Hold plugin via unsanitiz - CVE-2026-4915
Server panic via outgoing webhook responses - CVE-2026-28735
GitHub OAuth Scope Validation - CVE-2026-4635
Persistent notification timing attack causing server denial - CVE-2026-3473
Improper file ownership validation in the Boards API allows
Same weakness: CWE-22
- CVE-2026-46402
Microsoft UFO uses untrusted task_name in log paths, allowin - CVE-2026-44635
Kysely: JSON-path traversal injection via unsanitized path-l - CVE-2026-44353
Streamlink: Arbitrary local file read via file:// URI in HLS - CVE-2026-45571
go-git: Crafted repositories may modify main and submodule . - CVE-2026-48544
Taipy 4.1.1 Path Traversal via ElementLibrary.get_resource()
V. Comments for CVE-2026-4858
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