PT-2026-94361 · Mattermost · Mattermost

Juho Forsén

·

CVE-2026-12284

·

Published

2026-09-17

·

Updated

2026-09-17

CVSS v3.1

3.7

Low

VectorAV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
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

Fix

Origin Validation Error

Found an issue in the description? Have something to add? Feel free to write us 👾
dbugs@ptsecurity.com

Weakness Enumeration

CWE-346

Related Identifiers

CVE-2026-12284

Affected Products

Mattermost