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CVE-2025-12689— DoS in Calls plugin via malformed UTF-8 in WebSocket request

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 11.0.4及之前的11.0.x版本、10.12.2及之前的10.12.x版本和10.11.6及之前的10.11.x版本存在安全漏洞，该漏洞源于未检查WebSocket请求字段的UTF-8格式，可能导致通过发送畸形请求使Calls插件崩溃。

CVSS 6.5 · Medium EPSS 0.29% · P20
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I. Basic Information for CVE-2025-12689

Vulnerability Information
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Vulnerability Title
DoS in Calls plugin via malformed UTF-8 in WebSocket request
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1287
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 11.0.4及之前的11.0.x版本、10.12.2及之前的10.12.x版本和10.11.6及之前的10.11.x版本存在安全漏洞，该漏洞源于未检查WebSocket请求字段的UTF-8格式，可能导致通过发送畸形请求使Calls插件崩溃。
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 11.0.0 ~ 11.0.4 -

II. Public POCs for CVE-2025-12689

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III. Intelligence Information for CVE-2025-12689

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Same Patch Batch · Mattermost · 2025-12-17 · 7 CVEs total

CVE-2025-62190 4.3 MEDIUM CSRF Allows Call Initiation and Message Delivery
CVE-2025-13326 3.9 LOW Mattermost Desktop App fails to enable Hardened Runtime when packaged for Mac App Store
CVE-2025-13324 3.7 LOW Lack of Invalidation of Legacy Remote Cluster Invite Tokens After Confirmation
CVE-2025-13321 3.3 LOW Mattermost Desktop App logging sensitive information and fails to clear data on server del
CVE-2025-62690 3.1 LOW Open redirect in error page when link opened in new tab
CVE-2025-13352 3.0 LOW Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hija

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-1287

V. Comments for CVE-2025-12689

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