CVE-2023-48732

Keywords that trigger mentions are leaked to other users

Published Jan 2, 2024 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Description
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.

Remediation

Vendor Solution

Update Mattermost Server to versions 8.1.7, 9.3.0 or higher.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-0399 Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
Github GHSA Github GHSA GHSA-q7rx-w656-fwmv Mattermost notified all users in the channel when using WebSockets to respond individually
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Jun 3, 2025, 2:45 PM
Reserved
Dec 21, 2023, 8:00 AM
Status
Modified
Published
Jan 2, 2024, 10:15 AM
Modified
Jun 17, 2026, 6:34 AM