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Go/github.com/mattermost/mattermost-server CVE-2026-4273: medium 4.3, EPSS 0.14%

Mattermost doesn't validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation 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@v11.5.2+incompatible

Affected

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

Fixed versions

10.11.14+incompatible11.5.2+incompatible

Sources

CVE-2026-4273 · published · modified · JSON