BaseFortify

Publication date: 2026-09-17

Last updated on: 2026-09-18

Assigner: Mattermost, Inc.

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-17

Last Modified

2026-09-18

Generated

2026-09-20

EPSS Evaluated

N/A

NVD

CVE-2026-12284

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-346	The product does not properly verify that the source of data or communication is valid.

Attack-Flow Graph

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