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CVE-2025-27538— MFA Enforcement Bypass Allows Unauthorized Removal of MFA for Other Users

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 10.5.1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。

CVSS 2.2 · Low EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1136.003 · Cloud Account
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
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 10.5.1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

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III. Intelligence Information for CVE-2025-27538

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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

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-306

V. Comments for CVE-2025-27538

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