CVE-2026-28741— CSRF Protection Bypass Allows Updating a User's Authentication Method
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I. Basic Information for CVE-2026-28741
Vulnerability Information
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Vulnerability Title
CSRF Protection Bypass Allows Updating a User's Authentication Method
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨站请求伪造(CSRF)
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存在安全漏洞，该漏洞源于身份验证端点未验证CSRF令牌，可能导致攻击者通过CSRF攻击更新用户的身份验证方法。以下版本受到影响：10.11.12及之前的10.11.x版本、11.5.0及之前的11.5.x版本、11.4.2及之前的11.4.x版本和11.3.2及之前的11.3.x版本。
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 | 10.11.0 ~ 10.11.12 | - |
II. Public POCs for CVE-2026-28741
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2026-04-15 · 3 CVEs total
| CVE-2026-3590 | 6.5 MEDIUM | Race Condition in Guest Magic Link Authentication Allows Token Reuse |
| CVE-2026-27769 | 2.7 LOW | Connected Workspaces: Malicious remote server can manipulate arbitrary user's status |
IV. Related Vulnerabilities
Same product: Mattermost
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - 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} - CVE-2026-3524
Authorization Bypass in Mattermost Legal Hold Plugin Due to
Same vendor: Mattermost
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - 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} - CVE-2026-3524
Authorization Bypass in Mattermost Legal Hold Plugin Due to
Same weakness: CWE-352
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Emlog: Cross-Site Request Forgery in Admin Functions
V. Comments for CVE-2026-28741
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