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CVE-2025-13821— User profile update exposes password hash and MFA secrets

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 11.1.2及之前的11.1.x版本、10.11.9及之前的10.11.x版本和11.2.1及之前的11.2.x版本存在安全漏洞，该漏洞源于未清理WebSocket消息中的敏感数据，可能导致经过身份验证的用户通过个人资料昵称更新或电子邮件验证事件窃取密码哈希和MFA密钥。

CVSS 5.7 · Medium EPSS 0.20% · P10
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I. Basic Information for CVE-2025-13821

Vulnerability Information
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Vulnerability Title
User profile update exposes password hash and MFA secrets
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
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 11.1.2及之前的11.1.x版本、10.11.9及之前的10.11.x版本和11.2.1及之前的11.2.x版本存在安全漏洞，该漏洞源于未清理WebSocket消息中的敏感数据，可能导致经过身份验证的用户通过个人资料昵称更新或电子邮件验证事件窃取密码哈希和MFA密钥。
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 11.1.0 ~ 11.1.2 -

II. Public POCs for CVE-2025-13821

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III. Intelligence Information for CVE-2025-13821

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Same Patch Batch · Mattermost · 2026-02-16 · 7 CVEs total

CVE-2026-1046 7.6 HIGH Arbitrary application execution via unvalidated server-controlled URLs in Help menu
CVE-2026-0999 5.4 MEDIUM Authentication bypass via userID login when email and username login are disabled
CVE-2025-14350 4.3 MEDIUM Information disclosure via channel mentions in posts
CVE-2026-0997 4.3 MEDIUM Mattermost Zoom Plugin channel preference API lacks authorization checks
CVE-2026-0998 4.3 MEDIUM Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insu
CVE-2025-14573 3.8 LOW Team Admin Bypass of Invite Permissions via allow_open_invite Field

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-200

V. Comments for CVE-2025-13821

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