CVE-2023-1775

Unsanitized events sent over Websocket to regular users in a High Availability environment

Published Mar 31, 2023 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Description
When running in a High Availability configuration, Mattermost fails to sanitize some of the user_updated and post_deleted events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients.


Remediation

Vendor Solution

Update Mattermost to version v7.8.0, v7.1.6, v7.7.2, or higher.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2023-0949 When running in a High Availability configuration, Mattermost fails to sanitize some of the user_updated and post_deleted events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients.
Github GHSA Github GHSA GHSA-8jhh-3jf2-pfwr Mattermost vulnerable to information disclosure
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
Dec 6, 2024, 11:05 PM
Reserved
Mar 31, 2023, 11:26 AM
Status
Modified
Published
Mar 31, 2023, 12:15 PM
Modified
Jun 17, 2026, 5:28 AM