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Go/github.com/mattermost/mattermost-server CVE-2026-3433: medium 4.3, EPSS 0.30%

Mattermost doesn't restrict role_updated websocket event broadcasts to members of the affected team or channel

Action: Upgrade github.com/mattermost/mattermost-server to 10.11.17 or later.

go get github.com/mattermost/mattermost-server@v11.6.1
go get github.com/mattermost/mattermost-server@v11.5.5
go get github.com/mattermost/mattermost-server@v10.11.17

Affected

introducedfixedlast affected
11.6.011.6.1-
11.5.011.5.5-
10.11.010.11.17-

Fixed versions

11.6.111.5.510.11.17

Sources

CVE-2026-3433 · published · modified · JSON