CVE-2025-27538— MFA Enforcement Bypass Allows Unauthorized Removal of MFA for Other Users
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I. Basic Information for CVE-2025-27538
Vulnerability Information
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Vulnerability Title
MFA Enforcement Bypass Allows Unauthorized Removal of MFA for Other Users
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 10.5.x <= 10.5.1, 9.11.x <= 9.11.9 fail to enforce MFA checks in PUT /api/v4/users/user-id/mfa when the requesting user differs from the target user ID, which allows users with edit_other_users permission to activate or deactivate MFA for other users, even if those users have not set up MFA.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键功能的认证机制缺失
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 10.5.1及之前版本和9.11.9及之前版本存在安全漏洞，该漏洞源于MFA检查不充分，可能导致未经授权的MFA操作。
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 ~ 10.5.1 | - |
II. Public POCs for CVE-2025-27538
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2025-04-16 · 6 CVEs total
| CVE-2025-27936 | 5.3 MEDIUM | Webhook Secret Exposure via Timing attack in MSteams plugin |
| CVE-2025-27571 | 4.3 MEDIUM | Channel metadata visible in archived channels despite configuration setting |
| CVE-2025-2564 | 4.3 MEDIUM | Unauthorized View Access to Archived Channel Member Info |
| CVE-2025-24839 | 3.1 LOW | Unauthorized AI bot activation via Wrangler plugin |
| CVE-2025-31363 | 3.0 LOW | Data exfiltration via AI plugin Jira tool |
IV. Related Vulnerabilities
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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-306
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V. Comments for CVE-2025-27538
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