CVE-2026-9602— Mattermost Desktop App crashes when malformed arguments are provided to some exposed IPC methods
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | 0 ~ 6.0.2 | - |
II. Public POCs for CVE-2026-9602
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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Same vendor: Mattermost
- CVE-2026-8075
Posting a malicious markdown image crashes the Mattermost De - CVE-2026-6541
Unscoped updates to other playbooks' metric configuration - CVE-2026-9820
Mattermost schemes teams endpoint exposes private team invit - CVE-2026-9824
Remote cluster metadata enumeration via /share-channel autoc - CVE-2026-9597
Deactivated guest accounts can authenticate via magic-link t
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V. Comments for CVE-2026-9602
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