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CVE-2026-4858— Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.

Quick assessment

Affected
Mattermost Mattermost
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。

CVSS 8.0 · High EPSS 0.33% · P26

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 9

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
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

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III. Intelligence Information for CVE-2026-4858

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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

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-22

V. Comments for CVE-2026-4858

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