CVE-2026-12284— Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler
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 桌面应用版本 <=6.2.2.0 在 处理器中未对 IPC（进程间通信）发送方进行验证，这使得恶意或被入侵的 Mattermost 服务器（或拥有已连接服务器视图脚本访问权限的用户）能够通过 IPC 消息，断开属于其他已连接服务器的活跃通话。 Mattermost 安全公告 ID：MMSA-2026-00699
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | Mattermost | ≤ 6.2.2 |
affected |
6.3.0 |
unaffected | ||
6.2.3.0 |
unaffected |
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I. Basic Information for CVE-2026-12284
Vulnerability Information
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Vulnerability Title
Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost Desktop App versions <=6.2 6.2.2.0 fails to validate the IPC sender in the leaveCall handler which allows a malicious or compromised Mattermost server (or a user with script access to a connected server view) to disconnect an active call belonging to a different connected server via the desktopAPI.leaveCall IPC message. Mattermost Advisory ID: MMSA-2026-00699
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | 0 ~ 6.2.2 | - |
|
II. Public POCs for CVE-2026-12284
| # | POC Description | Source Link | Shenlong Link |
|---|
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