CVE-2023-1775: Unsanitized events sent over Websocket to regular users in a High Availability environment
First published: Fri Mar 31 2023(Updated: )
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.
Credit: responsibledisclosure@mattermost.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mattermost Mattermost Server | <7.1.6 | |
| Mattermost Mattermost Server | =7.7.1 |
Remedy
Update Mattermost to version v7.8.0, v7.1.6, v7.7.2, or higher.
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Reference Links
Frequently Asked Questions
What is CVE-2023-1775?
CVE-2023-1775 is a vulnerability in Mattermost that occurs when running in a High Availability configuration, allowing disclosure of sensitive information to some users.
What is the severity of CVE-2023-1775?
CVE-2023-1775 has a severity rating of medium (6.5).
Which versions of Mattermost are affected by CVE-2023-1775?
Mattermost Server versions up to and excluding 7.1.6, as well as version 7.7.1, are affected by CVE-2023-1775.
How does CVE-2023-1775 occur?
CVE-2023-1775 occurs due to the failure of Mattermost to sanitize certain user_updated and post_deleted events in a High Availability configuration, leading to the disclosure of sensitive information.
Is there a fix available for CVE-2023-1775?
Yes, Mattermost has released security updates to address the CVE-2023-1775 vulnerability. Please refer to the Mattermost website for more information.
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