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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

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-12284

Published

Mattermost

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "product": "Mattermost",
                    "vendor": "Mattermost",
                    "versions": [
                        {
                            "lessThanOrEqual": "6.2.2",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.3.0",
                            "status": "unaffected"
                        },
                        {
                            "version": "6.2.3.0",
                            "status": "unaffected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON