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CVE-2025-12419— Account takeover on OAuth/OpenID-enabled servers

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存在安全漏洞，该漏洞源于OAuth状态令牌验证不足，可能导致账户接管。以下版本受到影响：10.12.1及之前的10.12.x版本、10.11.4及之前的10.11.x版本、10.5.12及之前的10.5.x版本和11.0.3及之前的11.0.x版本。

CVSS 9.9 · Critical EPSS 0.34% · P26
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I. Basic Information for CVE-2025-12419

Vulnerability Information
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Vulnerability Title
Account takeover on OAuth/OpenID-enabled servers
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证算法的不正确实现
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存在安全漏洞，该漏洞源于OAuth状态令牌验证不足，可能导致账户接管。以下版本受到影响：10.12.1及之前的10.12.x版本、10.11.4及之前的10.11.x版本、10.5.12及之前的10.5.x版本和11.0.3及之前的11.0.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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Mattermost Mattermost 10.12.0 ~ 10.12.1 -

II. Public POCs for CVE-2025-12419

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III. Intelligence Information for CVE-2025-12419

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Same Patch Batch · Mattermost · 2025-11-27 · 3 CVEs total

CVE-2025-12421 9.9 CRITICAL Account Takeover via Code Exchange Endpoint
CVE-2025-12559 4.3 MEDIUM Information Disclosure in Common Teams API

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-303

V. Comments for CVE-2025-12419

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