CVE-2025-10545— Guest user can add unauthorized team users to private channels
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
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Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
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Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same vendor: Mattermost
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same weakness: CWE-863
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