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CVE-2025-53971— Channel and Team Membership APIs inadvertently allow loss of Member privileges.

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 10.5.8及之前版本的10.5.x版本和9.11.17及之前版本的9.11.x版本存在安全漏洞，该漏洞源于未正确验证团队方案角色修改的授权，可能导致团队管理员将团队成员降级为访客。

CVSS 3.8 · Low EPSS 0.20% · P10
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I. Basic Information for CVE-2025-53971

Vulnerability Information
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Vulnerability Title
Channel and Team Membership APIs inadvertently allow loss of Member privileges.
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 安全漏洞
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 10.5.8及之前版本的10.5.x版本和9.11.17及之前版本的9.11.x版本存在安全漏洞，该漏洞源于未正确验证团队方案角色修改的授权，可能导致团队管理员将团队成员降级为访客。
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 10.5.0 ~ 10.5.8 -

II. Public POCs for CVE-2025-53971

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III. Intelligence Information for CVE-2025-53971

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Same Patch Batch · Mattermost · 2025-08-21 · 9 CVEs total

CVE-2025-49222 6.8 MEDIUM Mattermost Shared Channel Upload Type Validation Bypass
CVE-2025-8023 6.8 MEDIUM Path Traversal in Template Upload Allows Uploading Files Outside Target Directory
CVE-2025-36530 6.8 MEDIUM Import Path Traversal Enables Unauthorized Unsigned Plugin Installation
CVE-2025-8402 4.9 MEDIUM Nil pointer dereference in bulk import crashes server
CVE-2025-6465 4.3 MEDIUM Path traversal in image upload with preview overwrite
CVE-2025-47870 4.3 MEDIUM Team invite ID leaked to team admin with no member invite privileges
CVE-2025-47700 3.5 LOW AI plugin APIs can be triggered using post actions
CVE-2025-49810 3.5 LOW Thread summarization allows persistent access to channel

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-863

V. Comments for CVE-2025-53971

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