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MEDIUM4.3

GHSA-h998-hxxj-8q83

Mattermost doesn't invalidate cached authentication state for active WebSocket connections during global session revocation

Quick fix

GHSA-h998-hxxj-8q83 — github.com/mattermost/mattermost-server: upgrade to the fixed version with the command below.

go get github.com/mattermost/mattermost-server@v11.7.1

Details

Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to invalidate cached authentication state for active WebSocket connections during global session revocation, which allows a user with an existing WebSocket connection to remain authenticated and continue receiving real-time events until the cached session expires or the client reconnects.. Mattermost Advisory ID: MMSA-2026-00664

Are you affected?

Enter the version of the package you're using.

Affected packages

Go/github.com/mattermost/mattermost-server
Introduced in: 11.7.0Fixed in: 11.7.1
Fixgo get github.com/mattermost/mattermost-server@v11.7.1
Go/github.com/mattermost/mattermost-server
Introduced in: 11.6.0Fixed in: 11.6.3
Fixgo get github.com/mattermost/mattermost-server@v11.6.3
Go/github.com/mattermost/mattermost-server
Introduced in: 11.5.0Fixed in: 11.5.6
Fixgo get github.com/mattermost/mattermost-server@v11.5.6
Go/github.com/mattermost/mattermost-server
Introduced in: 10.11.0Fixed in: 10.11.18
Fixgo get github.com/mattermost/mattermost-server@v10.11.18

References