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CVE-2026-12284

Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler

CVSS 3.1 3.8 LOWCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-12284

Published

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

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Affected versions, risk and source history

Related advisories and sources

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-12284 · CVE overview and exploitation status

cve-program · CVE-2026-12284

Related changes

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 13 Nov 06:11 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current

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