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CVE-2026-6961— CVE-2026-6961: Path traversal via unsanitized FileInfo.Name in Mattermost federation sync

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公司开源的一个开源协作平台。 Mattermost 11.6.1及之前的11.6.x版本、11.5.4及之前的11.5.x版本、10.11.15及之前的10.11.x版本和10.11.16及之前的10.11.x版本存在路径遍历漏洞，该漏洞源于未能清理从联邦对等端接收的FileInfo.Name字段，可能导致控制联邦服务器的攻击者通过文件名中的路径遍历序列将文件写入目标服务器文件存储中的任意位置。

CVSS 7.6 · High EPSS 0.45% · P38

Possible ATT&CK Techniques 1 AI

T1565.002 · Transmitted Data Manipulation

Affected Version Matrix 9

VendorProduct Version RangeStatus
Mattermost Mattermost 11.6.0≤ 11.6.1 affected
11.5.0≤ 11.5.4 affected
10.11.0≤ 10.11.15 affected
10.11.0≤ 10.11.16 affected
11.7.0 unaffected
11.6.2 unaffected
11.5.5 unaffected
10.11.16 unaffected
… +1 more rows
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I. Basic Information for CVE-2026-6961

Vulnerability Information
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Vulnerability Title
CVE-2026-6961: Path traversal via unsanitized FileInfo.Name in Mattermost federation sync
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to sanitize FileInfo.Name received from federated peers during shared channel file sync, which allows an attacker who controls a federated server to write files to arbitrary locations within the target server's filestore via path traversal sequences in the filename field.. Mattermost Advisory ID: MMSA-2026-00661
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L
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 11.6.1及之前的11.6.x版本、11.5.4及之前的11.5.x版本、10.11.15及之前的10.11.x版本和10.11.16及之前的10.11.x版本存在路径遍历漏洞，该漏洞源于未能清理从联邦对等端接收的FileInfo.Name字段，可能导致控制联邦服务器的攻击者通过文件名中的路径遍历序列将文件写入目标服务器文件存储中的任意位置。
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 ~ 11.6.1 -

II. Public POCs for CVE-2026-6961

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III. Intelligence Information for CVE-2026-6961

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Same Patch Batch · Mattermost · 2026-06-12 · 7 CVEs total

CVE-2026-7387 8.8 HIGH Mattermost group syncable endpoints allow privilege escalation via scheme_admin
CVE-2026-6739 6.7 MEDIUM Mattermost: Delegated admins could patch protected default system roles
CVE-2026-7184 6.5 MEDIUM Mattermost Remote Cluster PATCH API Leaks Authentication Tokens
CVE-2026-6046 5.3 MEDIUM Plugin bot username conflict allows user account to be used as bot identity in Mattermost
CVE-2026-6689 4.3 MEDIUM *Missing* {{invite_user}} *permission check on team creation allows unprivileged users to
CVE-2026-3433 4.3 MEDIUM Mattermost fails to scope role_updated websocket events to authorized team and channel mem

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-6961

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