CVE-2025-3446— Members Without Guest Invite Permissions Can Add Guests to Teams
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 10.6.1及之前的10.6.x版本、10.5.2及之前的10.5.x版本、10.4.4及之前的10.4.x版本和9.11.11及之前的9.11.x版本存在安全漏洞，该漏洞源于权限验证不足，可能导致通过API添加访客用户。
Possible ATT&CK Techniques 1 AI
T1078.004 · Cloud Accounts
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I. Basic Information for CVE-2025-3446
Vulnerability Information
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Vulnerability Title
Members Without Guest Invite Permissions Can Add Guests to Teams
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to check the correct permissions which allows authenticated users who only have permission to invite non-guest users to a team to add guest users to that team via the API to add a single user to a team.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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 10.6.1及之前的10.6.x版本、10.5.2及之前的10.5.x版本、10.4.4及之前的10.4.x版本和9.11.11及之前的9.11.x版本存在安全漏洞，该漏洞源于权限验证不足，可能导致通过API添加访客用户。
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 | 10.6.0 ~ 10.6.1 | - |
|
II. Public POCs for CVE-2025-3446
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2025-05-15 · 4 CVEs total
| CVE-2025-31947 | 5.8 MEDIUM | Repeated LDAP login failures can lock an LDAP account |
| CVE-2025-2527 | 4.3 MEDIUM | Improper access control to group information |
| CVE-2025-2570 | 2.7 LOW | System Admin Cannot Access Environment settings in System Console While System Manager Can |
IV. Related Vulnerabilities
Same product: Mattermost
-
CVE-2026-75587
Plaintext pre-auth secret exposure via Desktop App diagnosti -
CVE-2026-9693
Mattermost thread memberships persist after team removal, ex -
CVE-2026-9859
Mattermost Boards plugin didn’t enforce role-based authoriza -
CVE-2026-9816
Insufficient server-side validation of board member role fie -
CVE-2026-10080
Boards plugin panics on WebSocket command with non-string fi
Same vendor: Mattermost
-
CVE-2026-75587
Plaintext pre-auth secret exposure via Desktop App diagnosti -
CVE-2026-9693
Mattermost thread memberships persist after team removal, ex -
CVE-2026-9859
Mattermost Boards plugin didn’t enforce role-based authoriza -
CVE-2026-9816
Insufficient server-side validation of board member role fie -
CVE-2026-10080
Boards plugin panics on WebSocket command with non-string fi
Same weakness: CWE-863
V. Comments for CVE-2025-3446
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