tocsin

Go/github.com/mattermost/mattermost-server CVE-2026-28759: medium 4.3, EPSS 0.15%

Mattermost does not verify remote cluster channel access when processing shared channel membership removals in github.com/mattermost/mattermost-server

Action: Upgrade github.com/mattermost/mattermost-server to 10.11.14+incompatible or later.

go get github.com/mattermost/mattermost-server@v10.11.14+incompatible
go get github.com/mattermost/mattermost-server@v11.4.4+incompatible
go get github.com/mattermost/mattermost-server@v11.5.2+incompatible

Affected

introducedfixedlast affected
10.11.0+incompatible10.11.14+incompatible-
11.4.0+incompatible11.4.4+incompatible-
11.5.0+incompatible11.5.2+incompatible-

Fixed versions

10.11.14+incompatible11.4.4+incompatible11.5.2+incompatible

Sources

CVE-2026-28759 · published · modified · JSON