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CVE-2026-9602— Mattermost Desktop App crashes when malformed arguments are provided to some exposed IPC methods

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公司开源的一个开源协作平台。 Mattermost存在资源管理错误漏洞，该漏洞源于未能验证从Mattermost Web App发送到Desktop App的有效载荷，导致恶意服务器所有者通过将方法的有效载荷更改为畸形格式来使Mattermost Desktop App崩溃。以下版本受到影响：6.0.2及之前版本、5.6.13及之前版本。

CVSS 5.7 · Medium EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
Mattermost Mattermost ≤ 6.0.2 affected
≤ 5.6.13 affected
6.3.0 unaffected
6.2.1.0 unaffected
5.13.7.0 unaffected
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I. Basic Information for CVE-2026-9602

Vulnerability Information
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Vulnerability Title
Mattermost Desktop App crashes when malformed arguments are provided to some exposed IPC methods
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost Desktop App versions <=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Mattermost Web App to the Desktop App which allows a malicious server owner to crash the Mattermost Desktop App via changing the payload of a method to a malformed one. Mattermost Advisory ID: MMSA-2026-00678
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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司开源的一个开源协作平台。 Mattermost存在资源管理错误漏洞，该漏洞源于未能验证从Mattermost Web App发送到Desktop App的有效载荷，导致恶意服务器所有者通过将方法的有效载荷更改为畸形格式来使Mattermost Desktop App崩溃。以下版本受到影响：6.0.2及之前版本、5.6.13及之前版本。
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 0 ~ 6.0.2 -

II. Public POCs for CVE-2026-9602

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III. Intelligence Information for CVE-2026-9602

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IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-400

V. Comments for CVE-2026-9602

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