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CVE-2025-10545— Guest user can add unauthorized team users to private channels

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 10.5.10及之前的10.5.x版本和10.11.2及之前的10.11.x版本存在安全漏洞，该漏洞源于未能正确验证访客用户权限，可能导致访客用户通过/api/v4/channels/{channel_id}/members端点将任意团队成员添加到其私有频道。

CVSS 3.1 · Low EPSS 0.33% · P24
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I. Basic Information for CVE-2025-10545

Vulnerability Information
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Vulnerability Title
Guest user can add unauthorized team users to private channels
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/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 10.5.10及之前的10.5.x版本和10.11.2及之前的10.11.x版本存在安全漏洞，该漏洞源于未能正确验证访客用户权限，可能导致访客用户通过/api/v4/channels/{channel_id}/members端点将任意团队成员添加到其私有频道。
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 ~ 10.5.10 -

II. Public POCs for CVE-2025-10545

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III. Intelligence Information for CVE-2025-10545

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Same Patch Batch · Mattermost · 2025-10-16 · 7 CVEs total

CVE-2025-58073 8.1 HIGH Arbitrary Mattermost Team can be joined by manipulating the OAuth state
CVE-2025-58075 8.1 HIGH Arbitrary Mattermost Team can be joined by manipulating the SAML RelayState
CVE-2025-55035 6.1 MEDIUM Mattermost Desktop DoS when user has basic authentication server configured
CVE-2025-41410 5.4 MEDIUM Slack import bypasses email verification for team access controls
CVE-2025-41443 4.3 MEDIUM Guest user can discover active public channels
CVE-2025-54499 3.1 LOW Insecure string comparison enables timing attacks

IV. Related Vulnerabilities

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

V. Comments for CVE-2025-10545

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